first commit

+// AFHTTPRequestOperation.h
+// Copyright (c) 2011–2015 Alamofire Software Foundation (http://alamofire.org/)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#import <Foundation/Foundation.h>
+#import "AFURLConnectionOperation.h"
+
+/**
+ `AFHTTPRequestOperation` is a subclass of `AFURLConnectionOperation` for requests using the HTTP or HTTPS protocols. It encapsulates the concept of acceptable status codes and content types, which determine the success or failure of a request.
+ */
+@interface AFHTTPRequestOperation : AFURLConnectionOperation
+
+///------------------------------------------------
+/// @name Getting HTTP URL Connection Information
+///------------------------------------------------
+
+/**
+ The last HTTP response received by the operation's connection.
+ */
+@property (readonly, nonatomic, strong) NSHTTPURLResponse *response;
+
+/**
+ Responses sent from the server in data tasks created with `dataTaskWithRequest:success:failure:` and run using the `GET` / `POST` / et al. convenience methods are automatically validated and serialized by the response serializer. By default, this property is set to an AFHTTPResponse serializer, which uses the raw data as its response object. The serializer validates the status code to be in the `2XX` range, denoting success. If the response serializer generates an error in `-responseObjectForResponse:data:error:`, the `failure` callback of the session task or request operation will be executed; otherwise, the `success` callback will be executed.
+
+ @warning `responseSerializer` must not be `nil`. Setting a response serializer will clear out any cached value
+ */
+@property (nonatomic, strong) AFHTTPResponseSerializer <AFURLResponseSerialization> * responseSerializer;
+
+/**
+ An object constructed by the `responseSerializer` from the response and response data. Returns `nil` unless the operation `isFinished`, has a `response`, and has `responseData` with non-zero content length. If an error occurs during serialization, `nil` will be returned, and the `error` property will be populated with the serialization error.
+ */
+@property (readonly, nonatomic, strong) id responseObject;
+
+///-----------------------------------------------------------
+/// @name Setting Completion Block Success / Failure Callbacks
+///-----------------------------------------------------------
+
+/**
+ Sets the `completionBlock` property with a block that executes either the specified success or failure block, depending on the state of the request on completion. If `error` returns a value, which can be caused by an unacceptable status code or content type, then `failure` is executed. Otherwise, `success` is executed.
+
+ This method should be overridden in subclasses in order to specify the response object passed into the success block.
+
+ @param success The block to be executed on the completion of a successful request. This block has no return value and takes two arguments: the receiver operation and the object constructed from the response data of the request.
+ @param failure The block to be executed on the completion of an unsuccessful request. This block has no return value and takes two arguments: the receiver operation and the error that occurred during the request.
+ */
+- (void)setCompletionBlockWithSuccess:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
+                              failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure;
+
+@end

+// AFHTTPRequestOperation.m
+// Copyright (c) 2011–2015 Alamofire Software Foundation (http://alamofire.org/)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#import "AFHTTPRequestOperation.h"
+
+static dispatch_queue_t http_request_operation_processing_queue() {
+    static dispatch_queue_t af_http_request_operation_processing_queue;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        af_http_request_operation_processing_queue = dispatch_queue_create("com.alamofire.networking.http-request.processing", DISPATCH_QUEUE_CONCURRENT);
+    });
+
+    return af_http_request_operation_processing_queue;
+}
+
+static dispatch_group_t http_request_operation_completion_group() {
+    static dispatch_group_t af_http_request_operation_completion_group;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        af_http_request_operation_completion_group = dispatch_group_create();
+    });
+
+    return af_http_request_operation_completion_group;
+}
+
+#pragma mark -
+
+@interface AFURLConnectionOperation ()
+@property (readwrite, nonatomic, strong) NSURLRequest *request;
+@property (readwrite, nonatomic, strong) NSURLResponse *response;
+@end
+
+@interface AFHTTPRequestOperation ()
+@property (readwrite, nonatomic, strong) NSHTTPURLResponse *response;
+@property (readwrite, nonatomic, strong) id responseObject;
+@property (readwrite, nonatomic, strong) NSError *responseSerializationError;
+@property (readwrite, nonatomic, strong) NSRecursiveLock *lock;
+@end
+
+@implementation AFHTTPRequestOperation
+@dynamic response;
+@dynamic lock;
+
+- (instancetype)initWithRequest:(NSURLRequest *)urlRequest {
+    self = [super initWithRequest:urlRequest];
+    if (!self) {
+        return nil;
+    }
+
+    self.responseSerializer = [AFHTTPResponseSerializer serializer];
+
+    return self;
+}
+
+- (void)setResponseSerializer:(AFHTTPResponseSerializer <AFURLResponseSerialization> *)responseSerializer {
+    NSParameterAssert(responseSerializer);
+
+    [self.lock lock];
+    _responseSerializer = responseSerializer;
+    self.responseObject = nil;
+    self.responseSerializationError = nil;
+    [self.lock unlock];
+}
+
+- (id)responseObject {
+    [self.lock lock];
+    if (!_responseObject && [self isFinished] && !self.error) {
+        NSError *error = nil;
+        self.responseObject = [self.responseSerializer responseObjectForResponse:self.response data:self.responseData error:&error];
+        if (error) {
+            self.responseSerializationError = error;
+        }
+    }
+    [self.lock unlock];
+
+    return _responseObject;
+}
+
+- (NSError *)error {
+    if (_responseSerializationError) {
+        return _responseSerializationError;
+    } else {
+        return [super error];
+    }
+}
+
+#pragma mark - AFHTTPRequestOperation
+
+- (void)setCompletionBlockWithSuccess:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
+                              failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure
+{
+    // completionBlock is manually nilled out in AFURLConnectionOperation to break the retain cycle.
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Warc-retain-cycles"
+#pragma clang diagnostic ignored "-Wgnu"
+    self.completionBlock = ^{
+        if (self.completionGroup) {
+            dispatch_group_enter(self.completionGroup);
+        }
+
+        dispatch_async(http_request_operation_processing_queue(), ^{
+            if (self.error) {
+                if (failure) {
+                    dispatch_group_async(self.completionGroup ?: http_request_operation_completion_group(), self.completionQueue ?: dispatch_get_main_queue(), ^{
+                        failure(self, self.error);
+                    });
+                }
+            } else {
+                id responseObject = self.responseObject;
+                if (self.error) {
+                    if (failure) {
+                        dispatch_group_async(self.completionGroup ?: http_request_operation_completion_group(), self.completionQueue ?: dispatch_get_main_queue(), ^{
+                            failure(self, self.error);
+                        });
+                    }
+                } else {
+                    if (success) {
+                        dispatch_group_async(self.completionGroup ?: http_request_operation_completion_group(), self.completionQueue ?: dispatch_get_main_queue(), ^{
+                            success(self, responseObject);
+                        });
+                    }
+                }
+            }
+
+            if (self.completionGroup) {
+                dispatch_group_leave(self.completionGroup);
+            }
+        });
+    };
+#pragma clang diagnostic pop
+}
+
+#pragma mark - AFURLRequestOperation
+
+- (void)pause {
+    [super pause];
+
+    u_int64_t offset = 0;
+    if ([self.outputStream propertyForKey:NSStreamFileCurrentOffsetKey]) {
+        offset = [(NSNumber *)[self.outputStream propertyForKey:NSStreamFileCurrentOffsetKey] unsignedLongLongValue];
+    } else {
+        offset = [(NSData *)[self.outputStream propertyForKey:NSStreamDataWrittenToMemoryStreamKey] length];
+    }
+
+    NSMutableURLRequest *mutableURLRequest = [self.request mutableCopy];
+    if ([self.response respondsToSelector:@selector(allHeaderFields)] && [[self.response allHeaderFields] valueForKey:@"ETag"]) {
+        [mutableURLRequest setValue:[[self.response allHeaderFields] valueForKey:@"ETag"] forHTTPHeaderField:@"If-Range"];
+    }
+    [mutableURLRequest setValue:[NSString stringWithFormat:@"bytes=%llu-", offset] forHTTPHeaderField:@"Range"];
+    self.request = mutableURLRequest;
+}
+
+#pragma mark - NSSecureCoding
+
++ (BOOL)supportsSecureCoding {
+    return YES;
+}
+
+- (id)initWithCoder:(NSCoder *)decoder {
+    self = [super initWithCoder:decoder];
+    if (!self) {
+        return nil;
+    }
+
+    self.responseSerializer = [decoder decodeObjectOfClass:[AFHTTPResponseSerializer class] forKey:NSStringFromSelector(@selector(responseSerializer))];
+
+    return self;
+}
+
+- (void)encodeWithCoder:(NSCoder *)coder {
+    [super encodeWithCoder:coder];
+
+    [coder encodeObject:self.responseSerializer forKey:NSStringFromSelector(@selector(responseSerializer))];
+}
+
+#pragma mark - NSCopying
+
+- (id)copyWithZone:(NSZone *)zone {
+    AFHTTPRequestOperation *operation = [super copyWithZone:zone];
+
+    operation.responseSerializer = [self.responseSerializer copyWithZone:zone];
+    operation.completionQueue = self.completionQueue;
+    operation.completionGroup = self.completionGroup;
+
+    return operation;
+}
+
+@end

+// AFHTTPRequestOperationManager.h
+// Copyright (c) 2011–2015 Alamofire Software Foundation (http://alamofire.org/)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#import <Foundation/Foundation.h>
+#import <SystemConfiguration/SystemConfiguration.h>
+#import <Availability.h>
+
+#if __IPHONE_OS_VERSION_MIN_REQUIRED
+#import <MobileCoreServices/MobileCoreServices.h>
+#else
+#import <CoreServices/CoreServices.h>
+#endif
+
+#import "AFHTTPRequestOperation.h"
+#import "AFURLResponseSerialization.h"
+#import "AFURLRequestSerialization.h"
+#import "AFSecurityPolicy.h"
+#import "AFNetworkReachabilityManager.h"
+
+#ifndef NS_DESIGNATED_INITIALIZER
+#if __has_attribute(objc_designated_initializer)
+#define NS_DESIGNATED_INITIALIZER __attribute__((objc_designated_initializer))
+#else
+#define NS_DESIGNATED_INITIALIZER
+#endif
+#endif
+
+/**
+ `AFHTTPRequestOperationManager` encapsulates the common patterns of communicating with a web application over HTTP, including request creation, response serialization, network reachability monitoring, and security, as well as request operation management.
+
+ ## Subclassing Notes
+
+ Developers targeting iOS 7 or Mac OS X 10.9 or later that deal extensively with a web service are encouraged to subclass `AFHTTPSessionManager`, providing a class method that returns a shared singleton object on which authentication and other configuration can be shared across the application.
+
+ For developers targeting iOS 6 or Mac OS X 10.8 or earlier, `AFHTTPRequestOperationManager` may be used to similar effect.
+
+ ## Methods to Override
+
+ To change the behavior of all request operation construction for an `AFHTTPRequestOperationManager` subclass, override `HTTPRequestOperationWithRequest:success:failure`.
+
+ ## Serialization
+
+ Requests created by an HTTP client will contain default headers and encode parameters according to the `requestSerializer` property, which is an object conforming to `<AFURLRequestSerialization>`.
+
+ Responses received from the server are automatically validated and serialized by the `responseSerializers` property, which is an object conforming to `<AFURLResponseSerialization>`
+
+ ## URL Construction Using Relative Paths
+
+ For HTTP convenience methods, the request serializer constructs URLs from the path relative to the `-baseURL`, using `NSURL +URLWithString:relativeToURL:`, when provided. If `baseURL` is `nil`, `path` needs to resolve to a valid `NSURL` object using `NSURL +URLWithString:`.
+
+ Below are a few examples of how `baseURL` and relative paths interact:
+
+    NSURL *baseURL = [NSURL URLWithString:@"http://example.com/v1/"];
+    [NSURL URLWithString:@"foo" relativeToURL:baseURL];                  // http://example.com/v1/foo
+    [NSURL URLWithString:@"foo?bar=baz" relativeToURL:baseURL];          // http://example.com/v1/foo?bar=baz
+    [NSURL URLWithString:@"/foo" relativeToURL:baseURL];                 // http://example.com/foo
+    [NSURL URLWithString:@"foo/" relativeToURL:baseURL];                 // http://example.com/v1/foo
+    [NSURL URLWithString:@"/foo/" relativeToURL:baseURL];                // http://example.com/foo/
+    [NSURL URLWithString:@"http://example2.com/" relativeToURL:baseURL]; // http://example2.com/
+
+ Also important to note is that a trailing slash will be added to any `baseURL` without one. This would otherwise cause unexpected behavior when constructing URLs using paths without a leading slash.
+
+ ## Network Reachability Monitoring
+
+ Network reachability status and change monitoring is available through the `reachabilityManager` property. Applications may choose to monitor network reachability conditions in order to prevent or suspend any outbound requests. See `AFNetworkReachabilityManager` for more details.
+
+ ## NSSecureCoding & NSCopying Caveats
+
+ `AFHTTPRequestOperationManager` conforms to the `NSSecureCoding` and `NSCopying` protocols, allowing operations to be archived to disk, and copied in memory, respectively. There are a few minor caveats to keep in mind, however:
+
+ - Archives and copies of HTTP clients will be initialized with an empty operation queue.
+ - NSSecureCoding cannot serialize / deserialize block properties, so an archive of an HTTP client will not include any reachability callback block that may be set.
+ */
+@interface AFHTTPRequestOperationManager : NSObject <NSSecureCoding, NSCopying>
+
+/**
+ The URL used to monitor reachability, and construct requests from relative paths in methods like `requestWithMethod:URLString:parameters:`, and the `GET` / `POST` / et al. convenience methods.
+ */
+@property (readonly, nonatomic, strong) NSURL *baseURL;
+
+/**
+ Requests created with `requestWithMethod:URLString:parameters:` & `multipartFormRequestWithMethod:URLString:parameters:constructingBodyWithBlock:` are constructed with a set of default headers using a parameter serialization specified by this property. By default, this is set to an instance of `AFHTTPRequestSerializer`, which serializes query string parameters for `GET`, `HEAD`, and `DELETE` requests, or otherwise URL-form-encodes HTTP message bodies.
+
+ @warning `requestSerializer` must not be `nil`.
+ */
+@property (nonatomic, strong) AFHTTPRequestSerializer <AFURLRequestSerialization> * requestSerializer;
+
+/**
+ Responses sent from the server in data tasks created with `dataTaskWithRequest:success:failure:` and run using the `GET` / `POST` / et al. convenience methods are automatically validated and serialized by the response serializer. By default, this property is set to a JSON serializer, which serializes data from responses with a `application/json` MIME type, and falls back to the raw data object. The serializer validates the status code to be in the `2XX` range, denoting success. If the response serializer generates an error in `-responseObjectForResponse:data:error:`, the `failure` callback of the session task or request operation will be executed; otherwise, the `success` callback will be executed.
+
+ @warning `responseSerializer` must not be `nil`.
+ */
+@property (nonatomic, strong) AFHTTPResponseSerializer <AFURLResponseSerialization> * responseSerializer;
+
+/**
+ The operation queue on which request operations are scheduled and run.
+ */
+@property (nonatomic, strong) NSOperationQueue *operationQueue;
+
+///-------------------------------
+/// @name Managing URL Credentials
+///-------------------------------
+
+/**
+ Whether request operations should consult the credential storage for authenticating the connection. `YES` by default.
+
+ @see AFURLConnectionOperation -shouldUseCredentialStorage
+ */
+@property (nonatomic, assign) BOOL shouldUseCredentialStorage;
+
+/**
+ The credential used by request operations for authentication challenges.
+
+ @see AFURLConnectionOperation -credential
+ */
+@property (nonatomic, strong) NSURLCredential *credential;
+
+///-------------------------------
+/// @name Managing Security Policy
+///-------------------------------
+
+/**
+ The security policy used by created request operations to evaluate server trust for secure connections. `AFHTTPRequestOperationManager` uses the `defaultPolicy` unless otherwise specified.
+ */
+@property (nonatomic, strong) AFSecurityPolicy *securityPolicy;
+
+///------------------------------------
+/// @name Managing Network Reachability
+///------------------------------------
+
+/**
+ The network reachability manager. `AFHTTPRequestOperationManager` uses the `sharedManager` by default.
+ */
+@property (readwrite, nonatomic, strong) AFNetworkReachabilityManager *reachabilityManager;
+
+///-------------------------------
+/// @name Managing Callback Queues
+///-------------------------------
+
+/**
+ The dispatch queue for the `completionBlock` of request operations. If `NULL` (default), the main queue is used.
+ */
+#if OS_OBJECT_HAVE_OBJC_SUPPORT
+@property (nonatomic, strong) dispatch_queue_t completionQueue;
+#else
+@property (nonatomic, assign) dispatch_queue_t completionQueue;
+#endif
+
+/**
+ The dispatch group for the `completionBlock` of request operations. If `NULL` (default), a private dispatch group is used.
+ */
+#if OS_OBJECT_HAVE_OBJC_SUPPORT
+@property (nonatomic, strong) dispatch_group_t completionGroup;
+#else
+@property (nonatomic, assign) dispatch_group_t completionGroup;
+#endif
+
+///---------------------------------------------
+/// @name Creating and Initializing HTTP Clients
+///---------------------------------------------
+
+/**
+ Creates and returns an `AFHTTPRequestOperationManager` object.
+ */
++ (instancetype)manager;
+
+/**
+ Initializes an `AFHTTPRequestOperationManager` object with the specified base URL.
+
+ This is the designated initializer.
+
+ @param url The base URL for the HTTP client.
+
+ @return The newly-initialized HTTP client
+ */
+- (instancetype)initWithBaseURL:(NSURL *)url NS_DESIGNATED_INITIALIZER;
+
+///---------------------------------------
+/// @name Managing HTTP Request Operations
+///---------------------------------------
+
+/**
+ Creates an `AFHTTPRequestOperation`, and sets the response serializers to that of the HTTP client.
+
+ @param request The request object to be loaded asynchronously during execution of the operation.
+ @param success A block object to be executed when the request operation finishes successfully. This block has no return value and takes two arguments: the created request operation and the object created from the response data of request.
+ @param failure A block object to be executed when the request operation finishes unsuccessfully, or that finishes successfully, but encountered an error while parsing the response data. This block has no return value and takes two arguments:, the created request operation and the `NSError` object describing the network or parsing error that occurred.
+ */
+- (AFHTTPRequestOperation *)HTTPRequestOperationWithRequest:(NSURLRequest *)request
+                                                    success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
+                                                    failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure;
+
+///---------------------------
+/// @name Making HTTP Requests
+///---------------------------
+
+/**
+ Creates and runs an `AFHTTPRequestOperation` with a `GET` request.
+
+ @param URLString The URL string used to create the request URL.
+ @param parameters The parameters to be encoded according to the client request serializer.
+ @param success A block object to be executed when the request operation finishes successfully. This block has no return value and takes two arguments: the request operation, and the response object created by the client response serializer.
+ @param failure A block object to be executed when the request operation finishes unsuccessfully, or that finishes successfully, but encountered an error while parsing the response data. This block has no return value and takes a two arguments: the request operation and the error describing the network or parsing error that occurred.
+
+ @see -HTTPRequestOperationWithRequest:success:failure:
+ */
+- (AFHTTPRequestOperation *)GET:(NSString *)URLString
+                     parameters:(id)parameters
+                        success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
+                        failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure;
+
+/**
+ Creates and runs an `AFHTTPRequestOperation` with a `HEAD` request.
+
+ @param URLString The URL string used to create the request URL.
+ @param parameters The parameters to be encoded according to the client request serializer.
+ @param success A block object to be executed when the request operation finishes successfully. This block has no return value and takes a single arguments: the request operation.
+ @param failure A block object to be executed when the request operation finishes unsuccessfully, or that finishes successfully, but encountered an error while parsing the response data. This block has no return value and takes a two arguments: the request operation and the error describing the network or parsing error that occurred.
+
+ @see -HTTPRequestOperationWithRequest:success:failure:
+ */
+- (AFHTTPRequestOperation *)HEAD:(NSString *)URLString
+                      parameters:(id)parameters
+                         success:(void (^)(AFHTTPRequestOperation *operation))success
+                         failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure;
+
+/**
+ Creates and runs an `AFHTTPRequestOperation` with a `POST` request.
+
+ @param URLString The URL string used to create the request URL.
+ @param parameters The parameters to be encoded according to the client request serializer.
+ @param success A block object to be executed when the request operation finishes successfully. This block has no return value and takes two arguments: the request operation, and the response object created by the client response serializer.
+ @param failure A block object to be executed when the request operation finishes unsuccessfully, or that finishes successfully, but encountered an error while parsing the response data. This block has no return value and takes a two arguments: the request operation and the error describing the network or parsing error that occurred.
+
+ @see -HTTPRequestOperationWithRequest:success:failure:
+ */
+- (AFHTTPRequestOperation *)POST:(NSString *)URLString
+                      parameters:(id)parameters
+                         success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
+                         failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure;
+
+/**
+ Creates and runs an `AFHTTPRequestOperation` with a multipart `POST` request.
+
+ @param URLString The URL string used to create the request URL.
+ @param parameters The parameters to be encoded according to the client request serializer.
+ @param block A block that takes a single argument and appends data to the HTTP body. The block argument is an object adopting the `AFMultipartFormData` protocol.
+ @param success A block object to be executed when the request operation finishes successfully. This block has no return value and takes two arguments: the request operation, and the response object created by the client response serializer.
+ @param failure A block object to be executed when the request operation finishes unsuccessfully, or that finishes successfully, but encountered an error while parsing the response data. This block has no return value and takes a two arguments: the request operation and the error describing the network or parsing error that occurred.
+
+ @see -HTTPRequestOperationWithRequest:success:failure:
+ */
+- (AFHTTPRequestOperation *)POST:(NSString *)URLString
+                      parameters:(id)parameters
+       constructingBodyWithBlock:(void (^)(id <AFMultipartFormData> formData))block
+                         success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
+                         failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure;
+
+/**
+ Creates and runs an `AFHTTPRequestOperation` with a `PUT` request.
+
+ @param URLString The URL string used to create the request URL.
+ @param parameters The parameters to be encoded according to the client request serializer.
+ @param success A block object to be executed when the request operation finishes successfully. This block has no return value and takes two arguments: the request operation, and the response object created by the client response serializer.
+ @param failure A block object to be executed when the request operation finishes unsuccessfully, or that finishes successfully, but encountered an error while parsing the response data. This block has no return value and takes a two arguments: the request operation and the error describing the network or parsing error that occurred.
+
+ @see -HTTPRequestOperationWithRequest:success:failure:
+ */
+- (AFHTTPRequestOperation *)PUT:(NSString *)URLString
+                     parameters:(id)parameters
+                        success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
+                        failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure;
+
+/**
+ Creates and runs an `AFHTTPRequestOperation` with a `PATCH` request.
+
+ @param URLString The URL string used to create the request URL.
+ @param parameters The parameters to be encoded according to the client request serializer.
+ @param success A block object to be executed when the request operation finishes successfully. This block has no return value and takes two arguments: the request operation, and the response object created by the client response serializer.
+ @param failure A block object to be executed when the request operation finishes unsuccessfully, or that finishes successfully, but encountered an error while parsing the response data. This block has no return value and takes a two arguments: the request operation and the error describing the network or parsing error that occurred.
+
+ @see -HTTPRequestOperationWithRequest:success:failure:
+ */
+- (AFHTTPRequestOperation *)PATCH:(NSString *)URLString
+                       parameters:(id)parameters
+                          success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
+                          failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure;
+
+/**
+ Creates and runs an `AFHTTPRequestOperation` with a `DELETE` request.
+
+ @param URLString The URL string used to create the request URL.
+ @param parameters The parameters to be encoded according to the client request serializer.
+ @param success A block object to be executed when the request operation finishes successfully. This block has no return value and takes two arguments: the request operation, and the response object created by the client response serializer.
+ @param failure A block object to be executed when the request operation finishes unsuccessfully, or that finishes successfully, but encountered an error while parsing the response data. This block has no return value and takes a two arguments: the request operation and the error describing the network or parsing error that occurred.
+
+ @see -HTTPRequestOperationWithRequest:success:failure:
+ */
+- (AFHTTPRequestOperation *)DELETE:(NSString *)URLString
+                        parameters:(id)parameters
+                           success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
+                           failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure;
+
+@end
+

+// AFHTTPRequestOperationManager.m
+// Copyright (c) 2011–2015 Alamofire Software Foundation (http://alamofire.org/)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#import <Foundation/Foundation.h>
+
+#import "AFHTTPRequestOperationManager.h"
+#import "AFHTTPRequestOperation.h"
+
+#import <Availability.h>
+#import <Security/Security.h>
+
+#if defined(__IPHONE_OS_VERSION_MIN_REQUIRED)
+#import <UIKit/UIKit.h>
+#endif
+
+@interface AFHTTPRequestOperationManager ()
+@property (readwrite, nonatomic, strong) NSURL *baseURL;
+@end
+
+@implementation AFHTTPRequestOperationManager
+
++ (instancetype)manager {
+    return [[self alloc] initWithBaseURL:nil];
+}
+
+- (instancetype)init {
+    return [self initWithBaseURL:nil];
+}
+
+- (instancetype)initWithBaseURL:(NSURL *)url {
+    self = [super init];
+    if (!self) {
+        return nil;
+    }
+
+    // Ensure terminal slash for baseURL path, so that NSURL +URLWithString:relativeToURL: works as expected
+    if ([[url path] length] > 0 && ![[url absoluteString] hasSuffix:@"/"]) {
+        url = [url URLByAppendingPathComponent:@""];
+    }
+
+    self.baseURL = url;
+
+    self.requestSerializer = [AFHTTPRequestSerializer serializer];
+    self.responseSerializer = [AFJSONResponseSerializer serializer];
+
+    self.securityPolicy = [AFSecurityPolicy defaultPolicy];
+
+    self.reachabilityManager = [AFNetworkReachabilityManager sharedManager];
+
+    self.operationQueue = [[NSOperationQueue alloc] init];
+
+    self.shouldUseCredentialStorage = YES;
+
+    return self;
+}
+
+#pragma mark -
+
+#ifdef _SYSTEMCONFIGURATION_H
+#endif
+
+- (void)setRequestSerializer:(AFHTTPRequestSerializer <AFURLRequestSerialization> *)requestSerializer {
+    NSParameterAssert(requestSerializer);
+
+    _requestSerializer = requestSerializer;
+}
+
+- (void)setResponseSerializer:(AFHTTPResponseSerializer <AFURLResponseSerialization> *)responseSerializer {
+    NSParameterAssert(responseSerializer);
+
+    _responseSerializer = responseSerializer;
+}
+
+#pragma mark -
+
+- (AFHTTPRequestOperation *)HTTPRequestOperationWithHTTPMethod:(NSString *)method
+                                                     URLString:(NSString *)URLString
+                                                    parameters:(id)parameters
+                                                       success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
+                                                       failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure
+{
+    NSError *serializationError = nil;
+    NSMutableURLRequest *request = [self.requestSerializer requestWithMethod:method URLString:[[NSURL URLWithString:URLString relativeToURL:self.baseURL] absoluteString] parameters:parameters error:&serializationError];
+    if (serializationError) {
+        if (failure) {
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wgnu"
+            dispatch_async(self.completionQueue ?: dispatch_get_main_queue(), ^{
+                failure(nil, serializationError);
+            });
+#pragma clang diagnostic pop
+        }
+
+        return nil;
+    }
+
+    return [self HTTPRequestOperationWithRequest:request success:success failure:failure];
+}
+
+- (AFHTTPRequestOperation *)HTTPRequestOperationWithRequest:(NSURLRequest *)request
+                                                    success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
+                                                    failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure
+{
+    AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
+    operation.responseSerializer = self.responseSerializer;
+    operation.shouldUseCredentialStorage = self.shouldUseCredentialStorage;
+    operation.credential = self.credential;
+    operation.securityPolicy = self.securityPolicy;
+
+    [operation setCompletionBlockWithSuccess:success failure:failure];
+    operation.completionQueue = self.completionQueue;
+    operation.completionGroup = self.completionGroup;
+
+    return operation;
+}
+
+#pragma mark -
+
+- (AFHTTPRequestOperation *)GET:(NSString *)URLString
+                     parameters:(id)parameters
+                        success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
+                        failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure
+{
+    AFHTTPRequestOperation *operation = [self HTTPRequestOperationWithHTTPMethod:@"GET" URLString:URLString parameters:parameters success:success failure:failure];
+
+    [self.operationQueue addOperation:operation];
+
+    return operation;
+}
+
+- (AFHTTPRequestOperation *)HEAD:(NSString *)URLString
+                      parameters:(id)parameters
+                         success:(void (^)(AFHTTPRequestOperation *operation))success
+                         failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure
+{
+    AFHTTPRequestOperation *operation = [self HTTPRequestOperationWithHTTPMethod:@"HEAD" URLString:URLString parameters:parameters success:^(AFHTTPRequestOperation *requestOperation, __unused id responseObject) {
+        if (success) {
+            success(requestOperation);
+        }
+    } failure:failure];
+
+    [self.operationQueue addOperation:operation];
+
+    return operation;
+}
+
+- (AFHTTPRequestOperation *)POST:(NSString *)URLString
+                      parameters:(id)parameters
+                         success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
+                         failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure
+{
+    AFHTTPRequestOperation *operation = [self HTTPRequestOperationWithHTTPMethod:@"POST" URLString:URLString parameters:parameters success:success failure:failure];
+
+    [self.operationQueue addOperation:operation];
+
+    return operation;
+}
+
+- (AFHTTPRequestOperation *)POST:(NSString *)URLString
+                      parameters:(id)parameters
+       constructingBodyWithBlock:(void (^)(id <AFMultipartFormData> formData))block
+                         success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
+                         failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure
+{
+    NSError *serializationError = nil;
+    NSMutableURLRequest *request = [self.requestSerializer multipartFormRequestWithMethod:@"POST" URLString:[[NSURL URLWithString:URLString relativeToURL:self.baseURL] absoluteString] parameters:parameters constructingBodyWithBlock:block error:&serializationError];
+    if (serializationError) {
+        if (failure) {
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wgnu"
+            dispatch_async(self.completionQueue ?: dispatch_get_main_queue(), ^{
+                failure(nil, serializationError);
+            });
+#pragma clang diagnostic pop
+        }
+
+        return nil;
+    }
+
+    AFHTTPRequestOperation *operation = [self HTTPRequestOperationWithRequest:request success:success failure:failure];
+
+    [self.operationQueue addOperation:operation];
+
+    return operation;
+}
+
+- (AFHTTPRequestOperation *)PUT:(NSString *)URLString
+                     parameters:(id)parameters
+                        success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
+                        failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure
+{
+    AFHTTPRequestOperation *operation = [self HTTPRequestOperationWithHTTPMethod:@"PUT" URLString:URLString parameters:parameters success:success failure:failure];
+
+    [self.operationQueue addOperation:operation];
+
+    return operation;
+}
+
+- (AFHTTPRequestOperation *)PATCH:(NSString *)URLString
+                       parameters:(id)parameters
+                          success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
+                          failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure
+{
+    AFHTTPRequestOperation *operation = [self HTTPRequestOperationWithHTTPMethod:@"PATCH" URLString:URLString parameters:parameters success:success failure:failure];
+
+    [self.operationQueue addOperation:operation];
+
+    return operation;
+}
+
+- (AFHTTPRequestOperation *)DELETE:(NSString *)URLString
+                        parameters:(id)parameters
+                           success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
+                           failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure
+{
+    AFHTTPRequestOperation *operation = [self HTTPRequestOperationWithHTTPMethod:@"DELETE" URLString:URLString parameters:parameters success:success failure:failure];
+
+    [self.operationQueue addOperation:operation];
+
+    return operation;
+}
+
+#pragma mark - NSObject
+
+- (NSString *)description {
+    return [NSString stringWithFormat:@"<%@: %p, baseURL: %@, operationQueue: %@>", NSStringFromClass([self class]), self, [self.baseURL absoluteString], self.operationQueue];
+}
+
+#pragma mark - NSSecureCoding
+
++ (BOOL)supportsSecureCoding {
+    return YES;
+}
+
+- (id)initWithCoder:(NSCoder *)decoder {
+    NSURL *baseURL = [decoder decodeObjectForKey:NSStringFromSelector(@selector(baseURL))];
+
+    self = [self initWithBaseURL:baseURL];
+    if (!self) {
+        return nil;
+    }
+
+    self.requestSerializer = [decoder decodeObjectOfClass:[AFHTTPRequestSerializer class] forKey:NSStringFromSelector(@selector(requestSerializer))];
+    self.responseSerializer = [decoder decodeObjectOfClass:[AFHTTPResponseSerializer class] forKey:NSStringFromSelector(@selector(responseSerializer))];
+
+    return self;
+}
+
+- (void)encodeWithCoder:(NSCoder *)coder {
+    [coder encodeObject:self.baseURL forKey:NSStringFromSelector(@selector(baseURL))];
+    [coder encodeObject:self.requestSerializer forKey:NSStringFromSelector(@selector(requestSerializer))];
+    [coder encodeObject:self.responseSerializer forKey:NSStringFromSelector(@selector(responseSerializer))];
+}
+
+#pragma mark - NSCopying
+
+- (id)copyWithZone:(NSZone *)zone {
+    AFHTTPRequestOperationManager *HTTPClient = [[[self class] allocWithZone:zone] initWithBaseURL:self.baseURL];
+
+    HTTPClient.requestSerializer = [self.requestSerializer copyWithZone:zone];
+    HTTPClient.responseSerializer = [self.responseSerializer copyWithZone:zone];
+
+    return HTTPClient;
+}
+
+@end

+// AFHTTPSessionManager.h
+// Copyright (c) 2011–2015 Alamofire Software Foundation (http://alamofire.org/)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#import <Foundation/Foundation.h>
+#import <SystemConfiguration/SystemConfiguration.h>
+#import <Availability.h>
+
+#if __IPHONE_OS_VERSION_MIN_REQUIRED
+#import <MobileCoreServices/MobileCoreServices.h>
+#else
+#import <CoreServices/CoreServices.h>
+#endif
+
+#import "AFURLSessionManager.h"
+
+#ifndef NS_DESIGNATED_INITIALIZER
+#if __has_attribute(objc_designated_initializer)
+#define NS_DESIGNATED_INITIALIZER __attribute__((objc_designated_initializer))
+#else
+#define NS_DESIGNATED_INITIALIZER
+#endif
+#endif
+
+/**
+ `AFHTTPSessionManager` is a subclass of `AFURLSessionManager` with convenience methods for making HTTP requests. When a `baseURL` is provided, requests made with the `GET` / `POST` / et al. convenience methods can be made with relative paths.
+
+ ## Subclassing Notes
+
+ Developers targeting iOS 7 or Mac OS X 10.9 or later that deal extensively with a web service are encouraged to subclass `AFHTTPSessionManager`, providing a class method that returns a shared singleton object on which authentication and other configuration can be shared across the application.
+
+ For developers targeting iOS 6 or Mac OS X 10.8 or earlier, `AFHTTPRequestOperationManager` may be used to similar effect.
+
+ ## Methods to Override
+
+ To change the behavior of all data task operation construction, which is also used in the `GET` / `POST` / et al. convenience methods, override `dataTaskWithRequest:completionHandler:`.
+
+ ## Serialization
+
+ Requests created by an HTTP client will contain default headers and encode parameters according to the `requestSerializer` property, which is an object conforming to `<AFURLRequestSerialization>`.
+
+ Responses received from the server are automatically validated and serialized by the `responseSerializers` property, which is an object conforming to `<AFURLResponseSerialization>`
+
+ ## URL Construction Using Relative Paths
+
+ For HTTP convenience methods, the request serializer constructs URLs from the path relative to the `-baseURL`, using `NSURL +URLWithString:relativeToURL:`, when provided. If `baseURL` is `nil`, `path` needs to resolve to a valid `NSURL` object using `NSURL +URLWithString:`.
+
+ Below are a few examples of how `baseURL` and relative paths interact:
+
+    NSURL *baseURL = [NSURL URLWithString:@"http://example.com/v1/"];
+    [NSURL URLWithString:@"foo" relativeToURL:baseURL];                  // http://example.com/v1/foo
+    [NSURL URLWithString:@"foo?bar=baz" relativeToURL:baseURL];          // http://example.com/v1/foo?bar=baz
+    [NSURL URLWithString:@"/foo" relativeToURL:baseURL];                 // http://example.com/foo
+    [NSURL URLWithString:@"foo/" relativeToURL:baseURL];                 // http://example.com/v1/foo
+    [NSURL URLWithString:@"/foo/" relativeToURL:baseURL];                // http://example.com/foo/
+    [NSURL URLWithString:@"http://example2.com/" relativeToURL:baseURL]; // http://example2.com/
+
+ Also important to note is that a trailing slash will be added to any `baseURL` without one. This would otherwise cause unexpected behavior when constructing URLs using paths without a leading slash.
+
+ @warning Managers for background sessions must be owned for the duration of their use. This can be accomplished by creating an application-wide or shared singleton instance.
+ */
+
+#if (defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 70000) || (defined(__MAC_OS_X_VERSION_MAX_ALLOWED) && __MAC_OS_X_VERSION_MAX_ALLOWED >= 1090)
+
+@interface AFHTTPSessionManager : AFURLSessionManager <NSSecureCoding, NSCopying>
+
+/**
+ The URL used to monitor reachability, and construct requests from relative paths in methods like `requestWithMethod:URLString:parameters:`, and the `GET` / `POST` / et al. convenience methods.
+ */
+@property (readonly, nonatomic, strong) NSURL *baseURL;
+
+/**
+ Requests created with `requestWithMethod:URLString:parameters:` & `multipartFormRequestWithMethod:URLString:parameters:constructingBodyWithBlock:` are constructed with a set of default headers using a parameter serialization specified by this property. By default, this is set to an instance of `AFHTTPRequestSerializer`, which serializes query string parameters for `GET`, `HEAD`, and `DELETE` requests, or otherwise URL-form-encodes HTTP message bodies.
+
+ @warning `requestSerializer` must not be `nil`.
+ */
+@property (nonatomic, strong) AFHTTPRequestSerializer <AFURLRequestSerialization> * requestSerializer;
+
+/**
+ Responses sent from the server in data tasks created with `dataTaskWithRequest:success:failure:` and run using the `GET` / `POST` / et al. convenience methods are automatically validated and serialized by the response serializer. By default, this property is set to an instance of `AFJSONResponseSerializer`.
+
+ @warning `responseSerializer` must not be `nil`.
+ */
+@property (nonatomic, strong) AFHTTPResponseSerializer <AFURLResponseSerialization> * responseSerializer;
+
+///---------------------
+/// @name Initialization
+///---------------------
+
+/**
+ Creates and returns an `AFHTTPSessionManager` object.
+ */
++ (instancetype)manager;
+
+/**
+ Initializes an `AFHTTPSessionManager` object with the specified base URL.
+
+ @param url The base URL for the HTTP client.
+
+ @return The newly-initialized HTTP client
+ */
+- (instancetype)initWithBaseURL:(NSURL *)url;
+
+/**
+ Initializes an `AFHTTPSessionManager` object with the specified base URL.
+
+ This is the designated initializer.
+
+ @param url The base URL for the HTTP client.
+ @param configuration The configuration used to create the managed session.
+
+ @return The newly-initialized HTTP client
+ */
+- (instancetype)initWithBaseURL:(NSURL *)url
+           sessionConfiguration:(NSURLSessionConfiguration *)configuration NS_DESIGNATED_INITIALIZER;
+
+///---------------------------
+/// @name Making HTTP Requests
+///---------------------------
+
+/**
+ Creates and runs an `NSURLSessionDataTask` with a `GET` request.
+
+ @param URLString The URL string used to create the request URL.
+ @param parameters The parameters to be encoded according to the client request serializer.
+ @param success A block object to be executed when the task finishes successfully. This block has no return value and takes two arguments: the data task, and the response object created by the client response serializer.
+ @param failure A block object to be executed when the task finishes unsuccessfully, or that finishes successfully, but encountered an error while parsing the response data. This block has no return value and takes a two arguments: the data task and the error describing the network or parsing error that occurred.
+
+ @see -dataTaskWithRequest:completionHandler:
+ */
+- (NSURLSessionDataTask *)GET:(NSString *)URLString
+                   parameters:(id)parameters
+                      success:(void (^)(NSURLSessionDataTask *task, id responseObject))success
+                      failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure;
+
+/**
+ Creates and runs an `NSURLSessionDataTask` with a `HEAD` request.
+
+ @param URLString The URL string used to create the request URL.
+ @param parameters The parameters to be encoded according to the client request serializer.
+ @param success A block object to be executed when the task finishes successfully. This block has no return value and takes a single arguments: the data task.
+ @param failure A block object to be executed when the task finishes unsuccessfully, or that finishes successfully, but encountered an error while parsing the response data. This block has no return value and takes a two arguments: the data task and the error describing the network or parsing error that occurred.
+
+ @see -dataTaskWithRequest:completionHandler:
+ */
+- (NSURLSessionDataTask *)HEAD:(NSString *)URLString
+                    parameters:(id)parameters
+                       success:(void (^)(NSURLSessionDataTask *task))success
+                       failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure;
+
+/**
+ Creates and runs an `NSURLSessionDataTask` with a `POST` request.
+
+ @param URLString The URL string used to create the request URL.
+ @param parameters The parameters to be encoded according to the client request serializer.
+ @param success A block object to be executed when the task finishes successfully. This block has no return value and takes two arguments: the data task, and the response object created by the client response serializer.
+ @param failure A block object to be executed when the task finishes unsuccessfully, or that finishes successfully, but encountered an error while parsing the response data. This block has no return value and takes a two arguments: the data task and the error describing the network or parsing error that occurred.
+
+ @see -dataTaskWithRequest:completionHandler:
+ */
+- (NSURLSessionDataTask *)POST:(NSString *)URLString
+                    parameters:(id)parameters
+                       success:(void (^)(NSURLSessionDataTask *task, id responseObject))success
+                       failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure;
+
+/**
+ Creates and runs an `NSURLSessionDataTask` with a multipart `POST` request.
+
+ @param URLString The URL string used to create the request URL.
+ @param parameters The parameters to be encoded according to the client request serializer.
+ @param block A block that takes a single argument and appends data to the HTTP body. The block argument is an object adopting the `AFMultipartFormData` protocol.
+ @param success A block object to be executed when the task finishes successfully. This block has no return value and takes two arguments: the data task, and the response object created by the client response serializer.
+ @param failure A block object to be executed when the task finishes unsuccessfully, or that finishes successfully, but encountered an error while parsing the response data. This block has no return value and takes a two arguments: the data task and the error describing the network or parsing error that occurred.
+
+ @see -dataTaskWithRequest:completionHandler:
+ */
+- (NSURLSessionDataTask *)POST:(NSString *)URLString
+                    parameters:(id)parameters
+     constructingBodyWithBlock:(void (^)(id <AFMultipartFormData> formData))block
+                       success:(void (^)(NSURLSessionDataTask *task, id responseObject))success
+                       failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure;
+
+/**
+ Creates and runs an `NSURLSessionDataTask` with a `PUT` request.
+
+ @param URLString The URL string used to create the request URL.
+ @param parameters The parameters to be encoded according to the client request serializer.
+ @param success A block object to be executed when the task finishes successfully. This block has no return value and takes two arguments: the data task, and the response object created by the client response serializer.
+ @param failure A block object to be executed when the task finishes unsuccessfully, or that finishes successfully, but encountered an error while parsing the response data. This block has no return value and takes a two arguments: the data task and the error describing the network or parsing error that occurred.
+
+ @see -dataTaskWithRequest:completionHandler:
+ */
+- (NSURLSessionDataTask *)PUT:(NSString *)URLString
+                   parameters:(id)parameters
+                      success:(void (^)(NSURLSessionDataTask *task, id responseObject))success
+                      failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure;
+
+/**
+ Creates and runs an `NSURLSessionDataTask` with a `PATCH` request.
+
+ @param URLString The URL string used to create the request URL.
+ @param parameters The parameters to be encoded according to the client request serializer.
+ @param success A block object to be executed when the task finishes successfully. This block has no return value and takes two arguments: the data task, and the response object created by the client response serializer.
+ @param failure A block object to be executed when the task finishes unsuccessfully, or that finishes successfully, but encountered an error while parsing the response data. This block has no return value and takes a two arguments: the data task and the error describing the network or parsing error that occurred.
+
+ @see -dataTaskWithRequest:completionHandler:
+ */
+- (NSURLSessionDataTask *)PATCH:(NSString *)URLString
+                     parameters:(id)parameters
+                        success:(void (^)(NSURLSessionDataTask *task, id responseObject))success
+                        failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure;
+
+/**
+ Creates and runs an `NSURLSessionDataTask` with a `DELETE` request.
+
+ @param URLString The URL string used to create the request URL.
+ @param parameters The parameters to be encoded according to the client request serializer.
+ @param success A block object to be executed when the task finishes successfully. This block has no return value and takes two arguments: the data task, and the response object created by the client response serializer.
+ @param failure A block object to be executed when the task finishes unsuccessfully, or that finishes successfully, but encountered an error while parsing the response data. This block has no return value and takes a two arguments: the data task and the error describing the network or parsing error that occurred.
+
+ @see -dataTaskWithRequest:completionHandler:
+ */
+- (NSURLSessionDataTask *)DELETE:(NSString *)URLString
+                      parameters:(id)parameters
+                         success:(void (^)(NSURLSessionDataTask *task, id responseObject))success
+                         failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure;
+
+@end
+
+#endif

+// AFHTTPSessionManager.m
+// Copyright (c) 2011–2015 Alamofire Software Foundation (http://alamofire.org/)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#import "AFHTTPSessionManager.h"
+
+#if (defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 70000) || (defined(__MAC_OS_X_VERSION_MAX_ALLOWED) && __MAC_OS_X_VERSION_MAX_ALLOWED >= 1090)
+
+#import "AFURLRequestSerialization.h"
+#import "AFURLResponseSerialization.h"
+
+#import <Availability.h>
+#import <Security/Security.h>
+
+#ifdef _SYSTEMCONFIGURATION_H
+#import <netinet/in.h>
+#import <netinet6/in6.h>
+#import <arpa/inet.h>
+#import <ifaddrs.h>
+#import <netdb.h>
+#endif
+
+#if defined(__IPHONE_OS_VERSION_MIN_REQUIRED)
+#import <UIKit/UIKit.h>
+#endif
+
+@interface AFHTTPSessionManager ()
+@property (readwrite, nonatomic, strong) NSURL *baseURL;
+@end
+
+@implementation AFHTTPSessionManager
+@dynamic responseSerializer;
+
++ (instancetype)manager {
+    return [[[self class] alloc] initWithBaseURL:nil];
+}
+
+- (instancetype)init {
+    return [self initWithBaseURL:nil];
+}
+
+- (instancetype)initWithBaseURL:(NSURL *)url {
+    return [self initWithBaseURL:url sessionConfiguration:nil];
+}
+
+- (instancetype)initWithSessionConfiguration:(NSURLSessionConfiguration *)configuration {
+    return [self initWithBaseURL:nil sessionConfiguration:configuration];
+}
+
+- (instancetype)initWithBaseURL:(NSURL *)url
+           sessionConfiguration:(NSURLSessionConfiguration *)configuration
+{
+    self = [super initWithSessionConfiguration:configuration];
+    if (!self) {
+        return nil;
+    }
+
+    // Ensure terminal slash for baseURL path, so that NSURL +URLWithString:relativeToURL: works as expected
+    if ([[url path] length] > 0 && ![[url absoluteString] hasSuffix:@"/"]) {
+        url = [url URLByAppendingPathComponent:@""];
+    }
+
+    self.baseURL = url;
+
+    self.requestSerializer = [AFHTTPRequestSerializer serializer];
+    self.responseSerializer = [AFJSONResponseSerializer serializer];
+
+    return self;
+}
+
+#pragma mark -
+
+#ifdef _SYSTEMCONFIGURATION_H
+#endif
+
+- (void)setRequestSerializer:(AFHTTPRequestSerializer <AFURLRequestSerialization> *)requestSerializer {
+    NSParameterAssert(requestSerializer);
+
+    _requestSerializer = requestSerializer;
+}
+
+- (void)setResponseSerializer:(AFHTTPResponseSerializer <AFURLResponseSerialization> *)responseSerializer {
+    NSParameterAssert(responseSerializer);
+
+    [super setResponseSerializer:responseSerializer];
+}
+
+#pragma mark -
+
+- (NSURLSessionDataTask *)GET:(NSString *)URLString
+                   parameters:(id)parameters
+                      success:(void (^)(NSURLSessionDataTask *task, id responseObject))success
+                      failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure
+{
+    NSURLSessionDataTask *dataTask = [self dataTaskWithHTTPMethod:@"GET" URLString:URLString parameters:parameters success:success failure:failure];
+
+    [dataTask resume];
+
+    return dataTask;
+}
+
+- (NSURLSessionDataTask *)HEAD:(NSString *)URLString
+                    parameters:(id)parameters
+                       success:(void (^)(NSURLSessionDataTask *task))success
+                       failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure
+{
+    NSURLSessionDataTask *dataTask = [self dataTaskWithHTTPMethod:@"HEAD" URLString:URLString parameters:parameters success:^(NSURLSessionDataTask *task, __unused id responseObject) {
+        if (success) {
+            success(task);
+        }
+    } failure:failure];
+
+    [dataTask resume];
+
+    return dataTask;
+}
+
+- (NSURLSessionDataTask *)POST:(NSString *)URLString
+                    parameters:(id)parameters
+                       success:(void (^)(NSURLSessionDataTask *task, id responseObject))success
+                       failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure
+{
+    NSURLSessionDataTask *dataTask = [self dataTaskWithHTTPMethod:@"POST" URLString:URLString parameters:parameters success:success failure:failure];
+
+    [dataTask resume];
+
+    return dataTask;
+}
+
+- (NSURLSessionDataTask *)POST:(NSString *)URLString
+                    parameters:(id)parameters
+     constructingBodyWithBlock:(void (^)(id <AFMultipartFormData> formData))block
+                       success:(void (^)(NSURLSessionDataTask *task, id responseObject))success
+                       failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure
+{
+    NSError *serializationError = nil;
+    NSMutableURLRequest *request = [self.requestSerializer multipartFormRequestWithMethod:@"POST" URLString:[[NSURL URLWithString:URLString relativeToURL:self.baseURL] absoluteString] parameters:parameters constructingBodyWithBlock:block error:&serializationError];
+    if (serializationError) {
+        if (failure) {
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wgnu"
+            dispatch_async(self.completionQueue ?: dispatch_get_main_queue(), ^{
+                failure(nil, serializationError);
+            });
+#pragma clang diagnostic pop
+        }
+
+        return nil;
+    }
+
+    __block NSURLSessionDataTask *task = [self uploadTaskWithStreamedRequest:request progress:nil completionHandler:^(NSURLResponse * __unused response, id responseObject, NSError *error) {
+        if (error) {
+            if (failure) {
+                failure(task, error);
+            }
+        } else {
+            if (success) {
+                success(task, responseObject);
+            }
+        }
+    }];
+
+    [task resume];
+
+    return task;
+}
+
+- (NSURLSessionDataTask *)PUT:(NSString *)URLString
+                   parameters:(id)parameters
+                      success:(void (^)(NSURLSessionDataTask *task, id responseObject))success
+                      failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure
+{
+    NSURLSessionDataTask *dataTask = [self dataTaskWithHTTPMethod:@"PUT" URLString:URLString parameters:parameters success:success failure:failure];
+
+    [dataTask resume];
+
+    return dataTask;
+}
+
+- (NSURLSessionDataTask *)PATCH:(NSString *)URLString
+                     parameters:(id)parameters
+                        success:(void (^)(NSURLSessionDataTask *task, id responseObject))success
+                        failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure
+{
+    NSURLSessionDataTask *dataTask = [self dataTaskWithHTTPMethod:@"PATCH" URLString:URLString parameters:parameters success:success failure:failure];
+
+    [dataTask resume];
+
+    return dataTask;
+}
+
+- (NSURLSessionDataTask *)DELETE:(NSString *)URLString
+                      parameters:(id)parameters
+                         success:(void (^)(NSURLSessionDataTask *task, id responseObject))success
+                         failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure
+{
+    NSURLSessionDataTask *dataTask = [self dataTaskWithHTTPMethod:@"DELETE" URLString:URLString parameters:parameters success:success failure:failure];
+
+    [dataTask resume];
+
+    return dataTask;
+}
+
+- (NSURLSessionDataTask *)dataTaskWithHTTPMethod:(NSString *)method
+                                       URLString:(NSString *)URLString
+                                      parameters:(id)parameters
+                                         success:(void (^)(NSURLSessionDataTask *, id))success
+                                         failure:(void (^)(NSURLSessionDataTask *, NSError *))failure
+{
+    NSError *serializationError = nil;
+    NSMutableURLRequest *request = [self.requestSerializer requestWithMethod:method URLString:[[NSURL URLWithString:URLString relativeToURL:self.baseURL] absoluteString] parameters:parameters error:&serializationError];
+    if (serializationError) {
+        if (failure) {
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wgnu"
+            dispatch_async(self.completionQueue ?: dispatch_get_main_queue(), ^{
+                failure(nil, serializationError);
+            });
+#pragma clang diagnostic pop
+        }
+
+        return nil;
+    }
+
+    __block NSURLSessionDataTask *dataTask = nil;
+    dataTask = [self dataTaskWithRequest:request completionHandler:^(NSURLResponse * __unused response, id responseObject, NSError *error) {
+        if (error) {
+            if (failure) {
+                failure(dataTask, error);
+            }
+        } else {
+            if (success) {
+                success(dataTask, responseObject);
+            }
+        }
+    }];
+
+    return dataTask;
+}
+
+#pragma mark - NSObject
+
+- (NSString *)description {
+    return [NSString stringWithFormat:@"<%@: %p, baseURL: %@, session: %@, operationQueue: %@>", NSStringFromClass([self class]), self, [self.baseURL absoluteString], self.session, self.operationQueue];
+}
+
+#pragma mark - NSSecureCoding
+
++ (BOOL)supportsSecureCoding {
+    return YES;
+}
+
+- (id)initWithCoder:(NSCoder *)decoder {
+    NSURL *baseURL = [decoder decodeObjectOfClass:[NSURL class] forKey:NSStringFromSelector(@selector(baseURL))];
+    NSURLSessionConfiguration *configuration = [decoder decodeObjectOfClass:[NSURLSessionConfiguration class] forKey:@"sessionConfiguration"];
+    if (!configuration) {
+        NSString *configurationIdentifier = [decoder decodeObjectOfClass:[NSString class] forKey:@"identifier"];
+        if (configurationIdentifier) {
+#if (defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && __IPHONE_OS_VERSION_MIN_REQUIRED >= 80000) || (defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1100)
+            configuration = [NSURLSessionConfiguration backgroundSessionConfigurationWithIdentifier:configurationIdentifier];
+#else
+            configuration = [NSURLSessionConfiguration backgroundSessionConfiguration:configurationIdentifier];
+#endif
+        }
+    }
+
+    self = [self initWithBaseURL:baseURL sessionConfiguration:configuration];
+    if (!self) {
+        return nil;
+    }
+
+    self.requestSerializer = [decoder decodeObjectOfClass:[AFHTTPRequestSerializer class] forKey:NSStringFromSelector(@selector(requestSerializer))];
+    self.responseSerializer = [decoder decodeObjectOfClass:[AFHTTPResponseSerializer class] forKey:NSStringFromSelector(@selector(responseSerializer))];
+
+    return self;
+}
+
+- (void)encodeWithCoder:(NSCoder *)coder {
+    [super encodeWithCoder:coder];
+
+    [coder encodeObject:self.baseURL forKey:NSStringFromSelector(@selector(baseURL))];
+    if ([self.session.configuration conformsToProtocol:@protocol(NSCoding)]) {
+        [coder encodeObject:self.session.configuration forKey:@"sessionConfiguration"];
+    } else {
+        [coder encodeObject:self.session.configuration.identifier forKey:@"identifier"];
+    }
+    [coder encodeObject:self.requestSerializer forKey:NSStringFromSelector(@selector(requestSerializer))];
+    [coder encodeObject:self.responseSerializer forKey:NSStringFromSelector(@selector(responseSerializer))];
+}
+
+#pragma mark - NSCopying
+
+- (id)copyWithZone:(NSZone *)zone {
+    AFHTTPSessionManager *HTTPClient = [[[self class] allocWithZone:zone] initWithBaseURL:self.baseURL sessionConfiguration:self.session.configuration];
+
+    HTTPClient.requestSerializer = [self.requestSerializer copyWithZone:zone];
+    HTTPClient.responseSerializer = [self.responseSerializer copyWithZone:zone];
+
+    return HTTPClient;
+}
+
+@end
+
+#endif

+// AFNetworkReachabilityManager.h
+// Copyright (c) 2011–2015 Alamofire Software Foundation (http://alamofire.org/)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#import <Foundation/Foundation.h>
+#import <SystemConfiguration/SystemConfiguration.h>
+
+#ifndef NS_DESIGNATED_INITIALIZER
+#if __has_attribute(objc_designated_initializer)
+#define NS_DESIGNATED_INITIALIZER __attribute__((objc_designated_initializer))
+#else
+#define NS_DESIGNATED_INITIALIZER
+#endif
+#endif
+
+typedef NS_ENUM(NSInteger, AFNetworkReachabilityStatus) {
+    AFNetworkReachabilityStatusUnknown          = -1,
+    AFNetworkReachabilityStatusNotReachable     = 0,
+    AFNetworkReachabilityStatusReachableViaWWAN = 1,
+    AFNetworkReachabilityStatusReachableViaWiFi = 2,
+};
+
+/**
+ `AFNetworkReachabilityManager` monitors the reachability of domains, and addresses for both WWAN and WiFi network interfaces.
+
+ Reachability can be used to determine background information about why a network operation failed, or to trigger a network operation retrying when a connection is established. It should not be used to prevent a user from initiating a network request, as it's possible that an initial request may be required to establish reachability.
+
+ See Apple's Reachability Sample Code (https://developer.apple.com/library/ios/samplecode/reachability/)
+
+ @warning Instances of `AFNetworkReachabilityManager` must be started with `-startMonitoring` before reachability status can be determined.
+ */
+@interface AFNetworkReachabilityManager : NSObject
+
+/**
+ The current network reachability status.
+ */
+@property (readonly, nonatomic, assign) AFNetworkReachabilityStatus networkReachabilityStatus;
+
+/**
+ Whether or not the network is currently reachable.
+ */
+@property (readonly, nonatomic, assign, getter = isReachable) BOOL reachable;
+
+/**
+ Whether or not the network is currently reachable via WWAN.
+ */
+@property (readonly, nonatomic, assign, getter = isReachableViaWWAN) BOOL reachableViaWWAN;
+
+/**
+ Whether or not the network is currently reachable via WiFi.
+ */
+@property (readonly, nonatomic, assign, getter = isReachableViaWiFi) BOOL reachableViaWiFi;
+
+///---------------------
+/// @name Initialization
+///---------------------
+
+/**
+ Returns the shared network reachability manager.
+ */
++ (instancetype)sharedManager;
+
+/**
+ Creates and returns a network reachability manager for the specified domain.
+
+ @param domain The domain used to evaluate network reachability.
+
+ @return An initialized network reachability manager, actively monitoring the specified domain.
+ */
++ (instancetype)managerForDomain:(NSString *)domain;
+
+/**
+ Creates and returns a network reachability manager for the socket address.
+
+ @param address The socket address (`sockaddr_in`) used to evaluate network reachability.
+
+ @return An initialized network reachability manager, actively monitoring the specified socket address.
+ */
++ (instancetype)managerForAddress:(const void *)address;
+
+/**
+ Initializes an instance of a network reachability manager from the specified reachability object.
+
+ @param reachability The reachability object to monitor.
+
+ @return An initialized network reachability manager, actively monitoring the specified reachability.
+ */
+- (instancetype)initWithReachability:(SCNetworkReachabilityRef)reachability NS_DESIGNATED_INITIALIZER;
+
+///--------------------------------------------------
+/// @name Starting & Stopping Reachability Monitoring
+///--------------------------------------------------
+
+/**
+ Starts monitoring for changes in network reachability status.
+ */
+- (void)startMonitoring;
+
+/**
+ Stops monitoring for changes in network reachability status.
+ */
+- (void)stopMonitoring;
+
+///-------------------------------------------------
+/// @name Getting Localized Reachability Description
+///-------------------------------------------------
+
+/**
+ Returns a localized string representation of the current network reachability status.
+ */
+- (NSString *)localizedNetworkReachabilityStatusString;
+
+///---------------------------------------------------
+/// @name Setting Network Reachability Change Callback
+///---------------------------------------------------
+
+/**
+ Sets a callback to be executed when the network availability of the `baseURL` host changes.
+
+ @param block A block object to be executed when the network availability of the `baseURL` host changes.. This block has no return value and takes a single argument which represents the various reachability states from the device to the `baseURL`.
+ */
+- (void)setReachabilityStatusChangeBlock:(void (^)(AFNetworkReachabilityStatus status))block;
+
+@end
+
+///----------------
+/// @name Constants
+///----------------
+
+/**
+ ## Network Reachability
+
+ The following constants are provided by `AFNetworkReachabilityManager` as possible network reachability statuses.
+
+ enum {
+ AFNetworkReachabilityStatusUnknown,
+ AFNetworkReachabilityStatusNotReachable,
+ AFNetworkReachabilityStatusReachableViaWWAN,
+ AFNetworkReachabilityStatusReachableViaWiFi,
+ }
+
+ `AFNetworkReachabilityStatusUnknown`
+ The `baseURL` host reachability is not known.
+
+ `AFNetworkReachabilityStatusNotReachable`
+ The `baseURL` host cannot be reached.
+
+ `AFNetworkReachabilityStatusReachableViaWWAN`
+ The `baseURL` host can be reached via a cellular connection, such as EDGE or GPRS.
+
+ `AFNetworkReachabilityStatusReachableViaWiFi`
+ The `baseURL` host can be reached via a Wi-Fi connection.
+
+ ### Keys for Notification UserInfo Dictionary
+
+ Strings that are used as keys in a `userInfo` dictionary in a network reachability status change notification.
+
+ `AFNetworkingReachabilityNotificationStatusItem`
+ A key in the userInfo dictionary in a `AFNetworkingReachabilityDidChangeNotification` notification.
+ The corresponding value is an `NSNumber` object representing the `AFNetworkReachabilityStatus` value for the current reachability status.
+ */
+
+///--------------------
+/// @name Notifications
+///--------------------
+
+/**
+ Posted when network reachability changes.
+ This notification assigns no notification object. The `userInfo` dictionary contains an `NSNumber` object under the `AFNetworkingReachabilityNotificationStatusItem` key, representing the `AFNetworkReachabilityStatus` value for the current network reachability.
+
+ @warning In order for network reachability to be monitored, include the `SystemConfiguration` framework in the active target's "Link Binary With Library" build phase, and add `#import <SystemConfiguration/SystemConfiguration.h>` to the header prefix of the project (`Prefix.pch`).
+ */
+extern NSString * const AFNetworkingReachabilityDidChangeNotification;
+extern NSString * const AFNetworkingReachabilityNotificationStatusItem;
+
+///--------------------
+/// @name Functions
+///--------------------
+
+/**
+ Returns a localized string representation of an `AFNetworkReachabilityStatus` value.
+ */
+extern NSString * AFStringFromNetworkReachabilityStatus(AFNetworkReachabilityStatus status);

+// AFNetworkReachabilityManager.m
+// Copyright (c) 2011–2015 Alamofire Software Foundation (http://alamofire.org/)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#import "AFNetworkReachabilityManager.h"
+
+#import <netinet/in.h>
+#import <netinet6/in6.h>
+#import <arpa/inet.h>
+#import <ifaddrs.h>
+#import <netdb.h>
+
+NSString * const AFNetworkingReachabilityDidChangeNotification = @"com.alamofire.networking.reachability.change";
+NSString * const AFNetworkingReachabilityNotificationStatusItem = @"AFNetworkingReachabilityNotificationStatusItem";
+
+typedef void (^AFNetworkReachabilityStatusBlock)(AFNetworkReachabilityStatus status);
+
+typedef NS_ENUM(NSUInteger, AFNetworkReachabilityAssociation) {
+    AFNetworkReachabilityForAddress = 1,
+    AFNetworkReachabilityForAddressPair = 2,
+    AFNetworkReachabilityForName = 3,
+};
+
+NSString * AFStringFromNetworkReachabilityStatus(AFNetworkReachabilityStatus status) {
+    switch (status) {
+        case AFNetworkReachabilityStatusNotReachable:
+            return NSLocalizedStringFromTable(@"Not Reachable", @"AFNetworking", nil);
+        case AFNetworkReachabilityStatusReachableViaWWAN:
+            return NSLocalizedStringFromTable(@"Reachable via WWAN", @"AFNetworking", nil);
+        case AFNetworkReachabilityStatusReachableViaWiFi:
+            return NSLocalizedStringFromTable(@"Reachable via WiFi", @"AFNetworking", nil);
+        case AFNetworkReachabilityStatusUnknown:
+        default:
+            return NSLocalizedStringFromTable(@"Unknown", @"AFNetworking", nil);
+    }
+}
+
+static AFNetworkReachabilityStatus AFNetworkReachabilityStatusForFlags(SCNetworkReachabilityFlags flags) {
+    BOOL isReachable = ((flags & kSCNetworkReachabilityFlagsReachable) != 0);
+    BOOL needsConnection = ((flags & kSCNetworkReachabilityFlagsConnectionRequired) != 0);
+    BOOL canConnectionAutomatically = (((flags & kSCNetworkReachabilityFlagsConnectionOnDemand ) != 0) || ((flags & kSCNetworkReachabilityFlagsConnectionOnTraffic) != 0));
+    BOOL canConnectWithoutUserInteraction = (canConnectionAutomatically && (flags & kSCNetworkReachabilityFlagsInterventionRequired) == 0);
+    BOOL isNetworkReachable = (isReachable && (!needsConnection || canConnectWithoutUserInteraction));
+
+    AFNetworkReachabilityStatus status = AFNetworkReachabilityStatusUnknown;
+    if (isNetworkReachable == NO) {
+        status = AFNetworkReachabilityStatusNotReachable;
+    }
+#if	TARGET_OS_IPHONE
+    else if ((flags & kSCNetworkReachabilityFlagsIsWWAN) != 0) {
+        status = AFNetworkReachabilityStatusReachableViaWWAN;
+    }
+#endif
+    else {
+        status = AFNetworkReachabilityStatusReachableViaWiFi;
+    }
+
+    return status;
+}
+
+static void AFNetworkReachabilityCallback(SCNetworkReachabilityRef __unused target, SCNetworkReachabilityFlags flags, void *info) {
+    AFNetworkReachabilityStatus status = AFNetworkReachabilityStatusForFlags(flags);
+    AFNetworkReachabilityStatusBlock block = (__bridge AFNetworkReachabilityStatusBlock)info;
+    if (block) {
+        block(status);
+    }
+
+
+    dispatch_async(dispatch_get_main_queue(), ^{
+        NSNotificationCenter *notificationCenter = [NSNotificationCenter defaultCenter];
+        NSDictionary *userInfo = @{ AFNetworkingReachabilityNotificationStatusItem: @(status) };
+        [notificationCenter postNotificationName:AFNetworkingReachabilityDidChangeNotification object:nil userInfo:userInfo];
+    });
+
+}
+
+static const void * AFNetworkReachabilityRetainCallback(const void *info) {
+    return Block_copy(info);
+}
+
+static void AFNetworkReachabilityReleaseCallback(const void *info) {
+    if (info) {
+        Block_release(info);
+    }
+}
+
+@interface AFNetworkReachabilityManager ()
+@property (readwrite, nonatomic, assign) SCNetworkReachabilityRef networkReachability;
+@property (readwrite, nonatomic, assign) AFNetworkReachabilityAssociation networkReachabilityAssociation;
+@property (readwrite, nonatomic, assign) AFNetworkReachabilityStatus networkReachabilityStatus;
+@property (readwrite, nonatomic, copy) AFNetworkReachabilityStatusBlock networkReachabilityStatusBlock;
+@end
+
+@implementation AFNetworkReachabilityManager
+
++ (instancetype)sharedManager {
+    static AFNetworkReachabilityManager *_sharedManager = nil;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        struct sockaddr_in address;
+        bzero(&address, sizeof(address));
+        address.sin_len = sizeof(address);
+        address.sin_family = AF_INET;
+
+        _sharedManager = [self managerForAddress:&address];
+    });
+
+    return _sharedManager;
+}
+
++ (instancetype)managerForDomain:(NSString *)domain {
+    SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithName(kCFAllocatorDefault, [domain UTF8String]);
+
+    AFNetworkReachabilityManager *manager = [[self alloc] initWithReachability:reachability];
+    manager.networkReachabilityAssociation = AFNetworkReachabilityForName;
+
+    return manager;
+}
+
++ (instancetype)managerForAddress:(const void *)address {
+    SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithAddress(kCFAllocatorDefault, (const struct sockaddr *)address);
+
+    AFNetworkReachabilityManager *manager = [[self alloc] initWithReachability:reachability];
+    manager.networkReachabilityAssociation = AFNetworkReachabilityForAddress;
+
+    return manager;
+}
+
+- (instancetype)initWithReachability:(SCNetworkReachabilityRef)reachability {
+    self = [super init];
+    if (!self) {
+        return nil;
+    }
+
+    self.networkReachability = reachability;
+    self.networkReachabilityStatus = AFNetworkReachabilityStatusUnknown;
+
+    return self;
+}
+
+- (void)dealloc {
+    [self stopMonitoring];
+
+    if (_networkReachability) {
+        CFRelease(_networkReachability);
+        _networkReachability = NULL;
+    }
+}
+
+#pragma mark -
+
+- (BOOL)isReachable {
+    return [self isReachableViaWWAN] || [self isReachableViaWiFi];
+}
+
+- (BOOL)isReachableViaWWAN {
+    return self.networkReachabilityStatus == AFNetworkReachabilityStatusReachableViaWWAN;
+}
+
+- (BOOL)isReachableViaWiFi {
+    return self.networkReachabilityStatus == AFNetworkReachabilityStatusReachableViaWiFi;
+}
+
+#pragma mark -
+
+- (void)startMonitoring {
+    [self stopMonitoring];
+
+    if (!self.networkReachability) {
+        return;
+    }
+
+    __weak __typeof(self)weakSelf = self;
+    AFNetworkReachabilityStatusBlock callback = ^(AFNetworkReachabilityStatus status) {
+        __strong __typeof(weakSelf)strongSelf = weakSelf;
+
+        strongSelf.networkReachabilityStatus = status;
+        if (strongSelf.networkReachabilityStatusBlock) {
+            strongSelf.networkReachabilityStatusBlock(status);
+        }
+
+    };
+
+    SCNetworkReachabilityContext context = {0, (__bridge void *)callback, AFNetworkReachabilityRetainCallback, AFNetworkReachabilityReleaseCallback, NULL};
+    SCNetworkReachabilitySetCallback(self.networkReachability, AFNetworkReachabilityCallback, &context);
+    SCNetworkReachabilityScheduleWithRunLoop(self.networkReachability, CFRunLoopGetMain(), kCFRunLoopCommonModes);
+
+    switch (self.networkReachabilityAssociation) {
+        case AFNetworkReachabilityForName:
+            break;
+        case AFNetworkReachabilityForAddress:
+        case AFNetworkReachabilityForAddressPair:
+        default: {
+            dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0),^{
+                SCNetworkReachabilityFlags flags;
+                SCNetworkReachabilityGetFlags(self.networkReachability, &flags);
+                AFNetworkReachabilityStatus status = AFNetworkReachabilityStatusForFlags(flags);
+                dispatch_async(dispatch_get_main_queue(), ^{
+                    callback(status);
+
+                    NSNotificationCenter *notificationCenter = [NSNotificationCenter defaultCenter];
+                    [notificationCenter postNotificationName:AFNetworkingReachabilityDidChangeNotification object:nil userInfo:@{ AFNetworkingReachabilityNotificationStatusItem: @(status) }];
+
+
+                });
+            });
+        }
+            break;
+    }
+}
+
+- (void)stopMonitoring {
+    if (!self.networkReachability) {
+        return;
+    }
+
+    SCNetworkReachabilityUnscheduleFromRunLoop(self.networkReachability, CFRunLoopGetMain(), kCFRunLoopCommonModes);
+}
+
+#pragma mark -
+
+- (NSString *)localizedNetworkReachabilityStatusString {
+    return AFStringFromNetworkReachabilityStatus(self.networkReachabilityStatus);
+}
+
+#pragma mark -
+
+- (void)setReachabilityStatusChangeBlock:(void (^)(AFNetworkReachabilityStatus status))block {
+    self.networkReachabilityStatusBlock = block;
+}
+
+#pragma mark - NSKeyValueObserving
+
++ (NSSet *)keyPathsForValuesAffectingValueForKey:(NSString *)key {
+    if ([key isEqualToString:@"reachable"] || [key isEqualToString:@"reachableViaWWAN"] || [key isEqualToString:@"reachableViaWiFi"]) {
+        return [NSSet setWithObject:@"networkReachabilityStatus"];
+    }
+
+    return [super keyPathsForValuesAffectingValueForKey:key];
+}
+
+@end

+// AFNetworking.h
+//
+// Copyright (c) 2013 AFNetworking (http://afnetworking.com/)
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#import <Foundation/Foundation.h>
+#import <Availability.h>
+
+#ifndef _AFNETWORKING_
+    #define _AFNETWORKING_
+
+    #import "AFURLRequestSerialization.h"
+    #import "AFURLResponseSerialization.h"
+    #import "AFSecurityPolicy.h"
+    #import "AFNetworkReachabilityManager.h"
+
+    #import "AFURLConnectionOperation.h"
+    #import "AFHTTPRequestOperation.h"
+    #import "AFHTTPRequestOperationManager.h"
+
+#if ( ( defined(__MAC_OS_X_VERSION_MAX_ALLOWED) && __MAC_OS_X_VERSION_MAX_ALLOWED >= 1090) || \
+      ( defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 70000 ) )
+    #import "AFURLSessionManager.h"
+    #import "AFHTTPSessionManager.h"
+#endif
+
+#endif /* _AFNETWORKING_ */

+// AFSecurityPolicy.h
+// Copyright (c) 2011–2015 Alamofire Software Foundation (http://alamofire.org/)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#import <Foundation/Foundation.h>
+#import <Security/Security.h>
+
+typedef NS_ENUM(NSUInteger, AFSSLPinningMode) {
+    AFSSLPinningModeNone,
+    AFSSLPinningModePublicKey,
+    AFSSLPinningModeCertificate,
+};
+
+/**
+ `AFSecurityPolicy` evaluates server trust against pinned X.509 certificates and public keys over secure connections.
+
+ Adding pinned SSL certificates to your app helps prevent man-in-the-middle attacks and other vulnerabilities. Applications dealing with sensitive customer data or financial information are strongly encouraged to route all communication over an HTTPS connection with SSL pinning configured and enabled.
+ */
+@interface AFSecurityPolicy : NSObject
+
+/**
+ The criteria by which server trust should be evaluated against the pinned SSL certificates. Defaults to `AFSSLPinningModeNone`.
+ */
+@property (readonly, nonatomic, assign) AFSSLPinningMode SSLPinningMode;
+
+/**
+ Whether to evaluate an entire SSL certificate chain, or just the leaf certificate. Defaults to `YES`.
+ */
+@property (nonatomic, assign) BOOL validatesCertificateChain;
+
+/**
+ The certificates used to evaluate server trust according to the SSL pinning mode. By default, this property is set to any (`.cer`) certificates included in the app bundle.
+ */
+@property (nonatomic, strong) NSArray *pinnedCertificates;
+
+/**
+ Whether or not to trust servers with an invalid or expired SSL certificates. Defaults to `NO`.
+ */
+@property (nonatomic, assign) BOOL allowInvalidCertificates;
+
+/**
+ Whether or not to validate the domain name in the certificate's CN field. Defaults to `YES`.
+ */
+@property (nonatomic, assign) BOOL validatesDomainName;
+
+///-----------------------------------------
+/// @name Getting Specific Security Policies
+///-----------------------------------------
+
+/**
+ Returns the shared default security policy, which does not allow invalid certificates, validates domain name, and does not validate against pinned certificates or public keys.
+
+ @return The default security policy.
+ */
++ (instancetype)defaultPolicy;
+
+///---------------------
+/// @name Initialization
+///---------------------
+
+/**
+ Creates and returns a security policy with the specified pinning mode.
+
+ @param pinningMode The SSL pinning mode.
+
+ @return A new security policy.
+ */
++ (instancetype)policyWithPinningMode:(AFSSLPinningMode)pinningMode;
+
+///------------------------------
+/// @name Evaluating Server Trust
+///------------------------------
+
+/**
+ Whether or not the specified server trust should be accepted, based on the security policy.
+
+ This method should be used when responding to an authentication challenge from a server.
+
+ @param serverTrust The X.509 certificate trust of the server.
+
+ @return Whether or not to trust the server.
+
+ @warning This method has been deprecated in favor of `-evaluateServerTrust:forDomain:`.
+ */
+- (BOOL)evaluateServerTrust:(SecTrustRef)serverTrust DEPRECATED_ATTRIBUTE;
+
+/**
+ Whether or not the specified server trust should be accepted, based on the security policy.
+
+ This method should be used when responding to an authentication challenge from a server.
+
+ @param serverTrust The X.509 certificate trust of the server.
+ @param domain The domain of serverTrust. If `nil`, the domain will not be validated.
+
+ @return Whether or not to trust the server.
+ */
+- (BOOL)evaluateServerTrust:(SecTrustRef)serverTrust
+                  forDomain:(NSString *)domain;
+
+@end
+
+///----------------
+/// @name Constants
+///----------------
+
+/**
+ ## SSL Pinning Modes
+
+ The following constants are provided by `AFSSLPinningMode` as possible SSL pinning modes.
+
+ enum {
+ AFSSLPinningModeNone,
+ AFSSLPinningModePublicKey,
+ AFSSLPinningModeCertificate,
+ }
+
+ `AFSSLPinningModeNone`
+ Do not used pinned certificates to validate servers.
+
+ `AFSSLPinningModePublicKey`
+ Validate host certificates against public keys of pinned certificates.
+
+ `AFSSLPinningModeCertificate`
+ Validate host certificates against pinned certificates.
+*/

+// AFSecurityPolicy.m
+// Copyright (c) 2011–2015 Alamofire Software Foundation (http://alamofire.org/)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#import "AFSecurityPolicy.h"
+
+#import <AssertMacros.h>
+
+#if !defined(__IPHONE_OS_VERSION_MIN_REQUIRED)
+static NSData * AFSecKeyGetData(SecKeyRef key) {
+    CFDataRef data = NULL;
+
+    __Require_noErr_Quiet(SecItemExport(key, kSecFormatUnknown, kSecItemPemArmour, NULL, &data), _out);
+
+    return (__bridge_transfer NSData *)data;
+
+_out:
+    if (data) {
+        CFRelease(data);
+    }
+
+    return nil;
+}
+#endif
+
+static BOOL AFSecKeyIsEqualToKey(SecKeyRef key1, SecKeyRef key2) {
+#if defined(__IPHONE_OS_VERSION_MIN_REQUIRED)
+    return [(__bridge id)key1 isEqual:(__bridge id)key2];
+#else
+    return [AFSecKeyGetData(key1) isEqual:AFSecKeyGetData(key2)];
+#endif
+}
+
+static id AFPublicKeyForCertificate(NSData *certificate) {
+    id allowedPublicKey = nil;
+    SecCertificateRef allowedCertificate;
+    SecCertificateRef allowedCertificates[1];
+    CFArrayRef tempCertificates = nil;
+    SecPolicyRef policy = nil;
+    SecTrustRef allowedTrust = nil;
+    SecTrustResultType result;
+
+    allowedCertificate = SecCertificateCreateWithData(NULL, (__bridge CFDataRef)certificate);
+    __Require_Quiet(allowedCertificate != NULL, _out);
+
+    allowedCertificates[0] = allowedCertificate;
+    tempCertificates = CFArrayCreate(NULL, (const void **)allowedCertificates, 1, NULL);
+
+    policy = SecPolicyCreateBasicX509();
+    __Require_noErr_Quiet(SecTrustCreateWithCertificates(tempCertificates, policy, &allowedTrust), _out);
+    __Require_noErr_Quiet(SecTrustEvaluate(allowedTrust, &result), _out);
+
+    allowedPublicKey = (__bridge_transfer id)SecTrustCopyPublicKey(allowedTrust);
+
+_out:
+    if (allowedTrust) {
+        CFRelease(allowedTrust);
+    }
+
+    if (policy) {
+        CFRelease(policy);
+    }
+
+    if (tempCertificates) {
+        CFRelease(tempCertificates);
+    }
+
+    if (allowedCertificate) {
+        CFRelease(allowedCertificate);
+    }
+
+    return allowedPublicKey;
+}
+
+static BOOL AFServerTrustIsValid(SecTrustRef serverTrust) {
+    BOOL isValid = NO;
+    SecTrustResultType result;
+    __Require_noErr_Quiet(SecTrustEvaluate(serverTrust, &result), _out);
+
+    isValid = (result == kSecTrustResultUnspecified || result == kSecTrustResultProceed);
+
+_out:
+    return isValid;
+}
+
+static NSArray * AFCertificateTrustChainForServerTrust(SecTrustRef serverTrust) {
+    CFIndex certificateCount = SecTrustGetCertificateCount(serverTrust);
+    NSMutableArray *trustChain = [NSMutableArray arrayWithCapacity:(NSUInteger)certificateCount];
+
+    for (CFIndex i = 0; i < certificateCount; i++) {
+        SecCertificateRef certificate = SecTrustGetCertificateAtIndex(serverTrust, i);
+        [trustChain addObject:(__bridge_transfer NSData *)SecCertificateCopyData(certificate)];
+    }
+
+    return [NSArray arrayWithArray:trustChain];
+}
+
+static NSArray * AFPublicKeyTrustChainForServerTrust(SecTrustRef serverTrust) {
+    SecPolicyRef policy = SecPolicyCreateBasicX509();
+    CFIndex certificateCount = SecTrustGetCertificateCount(serverTrust);
+    NSMutableArray *trustChain = [NSMutableArray arrayWithCapacity:(NSUInteger)certificateCount];
+    for (CFIndex i = 0; i < certificateCount; i++) {
+        SecCertificateRef certificate = SecTrustGetCertificateAtIndex(serverTrust, i);
+
+        SecCertificateRef someCertificates[] = {certificate};
+        CFArrayRef certificates = CFArrayCreate(NULL, (const void **)someCertificates, 1, NULL);
+
+        SecTrustRef trust;
+        __Require_noErr_Quiet(SecTrustCreateWithCertificates(certificates, policy, &trust), _out);
+
+        SecTrustResultType result;
+        __Require_noErr_Quiet(SecTrustEvaluate(trust, &result), _out);
+
+        [trustChain addObject:(__bridge_transfer id)SecTrustCopyPublicKey(trust)];
+
+    _out:
+        if (trust) {
+            CFRelease(trust);
+        }
+
+        if (certificates) {
+            CFRelease(certificates);
+        }
+
+        continue;
+    }
+    CFRelease(policy);
+
+    return [NSArray arrayWithArray:trustChain];
+}
+
+#pragma mark -
+
+@interface AFSecurityPolicy()
+@property (readwrite, nonatomic, assign) AFSSLPinningMode SSLPinningMode;
+@property (readwrite, nonatomic, strong) NSArray *pinnedPublicKeys;
+@end
+
+@implementation AFSecurityPolicy
+
++ (NSArray *)defaultPinnedCertificates {
+    static NSArray *_defaultPinnedCertificates = nil;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        NSBundle *bundle = [NSBundle bundleForClass:[self class]];
+        NSArray *paths = [bundle pathsForResourcesOfType:@"cer" inDirectory:@"."];
+
+        NSMutableArray *certificates = [NSMutableArray arrayWithCapacity:[paths count]];
+        for (NSString *path in paths) {
+            NSData *certificateData = [NSData dataWithContentsOfFile:path];
+            [certificates addObject:certificateData];
+        }
+
+        _defaultPinnedCertificates = [[NSArray alloc] initWithArray:certificates];
+    });
+
+    return _defaultPinnedCertificates;
+}
+
++ (instancetype)defaultPolicy {
+    AFSecurityPolicy *securityPolicy = [[self alloc] init];
+    securityPolicy.SSLPinningMode = AFSSLPinningModeNone;
+
+    return securityPolicy;
+}
+
++ (instancetype)policyWithPinningMode:(AFSSLPinningMode)pinningMode {
+    AFSecurityPolicy *securityPolicy = [[self alloc] init];
+    securityPolicy.SSLPinningMode = pinningMode;
+
+    [securityPolicy setPinnedCertificates:[self defaultPinnedCertificates]];
+
+    return securityPolicy;
+}
+
+- (id)init {
+    self = [super init];
+    if (!self) {
+        return nil;
+    }
+
+    self.validatesCertificateChain = YES;
+    self.validatesDomainName = YES;
+
+    return self;
+}
+
+- (void)setPinnedCertificates:(NSArray *)pinnedCertificates {
+    _pinnedCertificates = pinnedCertificates;
+
+    if (self.pinnedCertificates) {
+        NSMutableArray *mutablePinnedPublicKeys = [NSMutableArray arrayWithCapacity:[self.pinnedCertificates count]];
+        for (NSData *certificate in self.pinnedCertificates) {
+            id publicKey = AFPublicKeyForCertificate(certificate);
+            if (!publicKey) {
+                continue;
+            }
+            [mutablePinnedPublicKeys addObject:publicKey];
+        }
+        self.pinnedPublicKeys = [NSArray arrayWithArray:mutablePinnedPublicKeys];
+    } else {
+        self.pinnedPublicKeys = nil;
+    }
+}
+
+#pragma mark -
+
+- (BOOL)evaluateServerTrust:(SecTrustRef)serverTrust {
+    return [self evaluateServerTrust:serverTrust forDomain:nil];
+}
+
+- (BOOL)evaluateServerTrust:(SecTrustRef)serverTrust
+                  forDomain:(NSString *)domain
+{
+    NSMutableArray *policies = [NSMutableArray array];
+    if (self.validatesDomainName) {
+        [policies addObject:(__bridge_transfer id)SecPolicyCreateSSL(true, (__bridge CFStringRef)domain)];
+    } else {
+        [policies addObject:(__bridge_transfer id)SecPolicyCreateBasicX509()];
+    }
+
+    SecTrustSetPolicies(serverTrust, (__bridge CFArrayRef)policies);
+
+    if (self.SSLPinningMode == AFSSLPinningModeNone) {
+        if (self.allowInvalidCertificates || AFServerTrustIsValid(serverTrust)){
+            return YES;
+        } else {
+            return NO;
+        }
+    } else if (!AFServerTrustIsValid(serverTrust) && !self.allowInvalidCertificates) {
+        return NO;
+    }
+
+    NSArray *serverCertificates = AFCertificateTrustChainForServerTrust(serverTrust);
+    switch (self.SSLPinningMode) {
+        case AFSSLPinningModeNone:
+        default:
+            return NO;
+        case AFSSLPinningModeCertificate: {
+            NSMutableArray *pinnedCertificates = [NSMutableArray array];
+            for (NSData *certificateData in self.pinnedCertificates) {
+                [pinnedCertificates addObject:(__bridge_transfer id)SecCertificateCreateWithData(NULL, (__bridge CFDataRef)certificateData)];
+            }
+            SecTrustSetAnchorCertificates(serverTrust, (__bridge CFArrayRef)pinnedCertificates);
+
+            if (!AFServerTrustIsValid(serverTrust)) {
+                return NO;
+            }
+
+            if (!self.validatesCertificateChain) {
+                return YES;
+            }
+
+            NSUInteger trustedCertificateCount = 0;
+            for (NSData *trustChainCertificate in serverCertificates) {
+                if ([self.pinnedCertificates containsObject:trustChainCertificate]) {
+                    trustedCertificateCount++;
+                }
+            }
+
+            return trustedCertificateCount == [serverCertificates count];
+        }
+        case AFSSLPinningModePublicKey: {
+            NSUInteger trustedPublicKeyCount = 0;
+            NSArray *publicKeys = AFPublicKeyTrustChainForServerTrust(serverTrust);
+            if (!self.validatesCertificateChain && [publicKeys count] > 0) {
+                publicKeys = @[[publicKeys firstObject]];
+            }
+
+            for (id trustChainPublicKey in publicKeys) {
+                for (id pinnedPublicKey in self.pinnedPublicKeys) {
+                    if (AFSecKeyIsEqualToKey((__bridge SecKeyRef)trustChainPublicKey, (__bridge SecKeyRef)pinnedPublicKey)) {
+                        trustedPublicKeyCount += 1;
+                    }
+                }
+            }
+
+            return trustedPublicKeyCount > 0 && ((self.validatesCertificateChain && trustedPublicKeyCount == [serverCertificates count]) || (!self.validatesCertificateChain && trustedPublicKeyCount >= 1));
+        }
+    }
+
+    return NO;
+}
+
+#pragma mark - NSKeyValueObserving
+
++ (NSSet *)keyPathsForValuesAffectingPinnedPublicKeys {
+    return [NSSet setWithObject:@"pinnedCertificates"];
+}
+
+@end

+// AFURLConnectionOperation.h
+// Copyright (c) 2011–2015 Alamofire Software Foundation (http://alamofire.org/)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#import <Foundation/Foundation.h>
+
+#import <Availability.h>
+#import "AFURLRequestSerialization.h"
+#import "AFURLResponseSerialization.h"
+#import "AFSecurityPolicy.h"
+
+#ifndef NS_DESIGNATED_INITIALIZER
+#if __has_attribute(objc_designated_initializer)
+#define NS_DESIGNATED_INITIALIZER __attribute__((objc_designated_initializer))
+#else
+#define NS_DESIGNATED_INITIALIZER
+#endif
+#endif
+
+/**
+ `AFURLConnectionOperation` is a subclass of `NSOperation` that implements `NSURLConnection` delegate methods.
+
+ ## Subclassing Notes
+
+ This is the base class of all network request operations. You may wish to create your own subclass in order to implement additional `NSURLConnection` delegate methods (see "`NSURLConnection` Delegate Methods" below), or to provide additional properties and/or class constructors.
+
+ If you are creating a subclass that communicates over the HTTP or HTTPS protocols, you may want to consider subclassing `AFHTTPRequestOperation` instead, as it supports specifying acceptable content types or status codes.
+
+ ## NSURLConnection Delegate Methods
+
+ `AFURLConnectionOperation` implements the following `NSURLConnection` delegate methods:
+
+ - `connection:didReceiveResponse:`
+ - `connection:didReceiveData:`
+ - `connectionDidFinishLoading:`
+ - `connection:didFailWithError:`
+ - `connection:didSendBodyData:totalBytesWritten:totalBytesExpectedToWrite:`
+ - `connection:willCacheResponse:`
+ - `connectionShouldUseCredentialStorage:`
+ - `connection:needNewBodyStream:`
+ - `connection:willSendRequestForAuthenticationChallenge:`
+
+ If any of these methods are overridden in a subclass, they _must_ call the `super` implementation first.
+
+ ## Callbacks and Completion Blocks
+
+ The built-in `completionBlock` provided by `NSOperation` allows for custom behavior to be executed after the request finishes. It is a common pattern for class constructors in subclasses to take callback block parameters, and execute them conditionally in the body of its `completionBlock`. Make sure to handle cancelled operations appropriately when setting a `completionBlock` (i.e. returning early before parsing response data). See the implementation of any of the `AFHTTPRequestOperation` subclasses for an example of this.
+
+ Subclasses are strongly discouraged from overriding `setCompletionBlock:`, as `AFURLConnectionOperation`'s implementation includes a workaround to mitigate retain cycles, and what Apple rather ominously refers to as ["The Deallocation Problem"](http://developer.apple.com/library/ios/#technotes/tn2109/).
+
+ ## SSL Pinning
+
+ Relying on the CA trust model to validate SSL certificates exposes your app to security vulnerabilities, such as man-in-the-middle attacks. For applications that connect to known servers, SSL certificate pinning provides an increased level of security, by checking server certificate validity against those specified in the app bundle.
+
+ SSL with certificate pinning is strongly recommended for any application that transmits sensitive information to an external webservice.
+
+ Connections will be validated on all matching certificates with a `.cer` extension in the bundle root.
+
+ ## App Extensions
+
+ When using AFNetworking in an App Extension, `#define AF_APP_EXTENSIONS` to avoid using unavailable APIs.
+
+ ## NSCoding & NSCopying Conformance
+
+ `AFURLConnectionOperation` conforms to the `NSCoding` and `NSCopying` protocols, allowing operations to be archived to disk, and copied in memory, respectively. However, because of the intrinsic limitations of capturing the exact state of an operation at a particular moment, there are some important caveats to keep in mind:
+
+ ### NSCoding Caveats
+
+ - Encoded operations do not include any block or stream properties. Be sure to set `completionBlock`, `outputStream`, and any callback blocks as necessary when using `-initWithCoder:` or `NSKeyedUnarchiver`.
+ - Operations are paused on `encodeWithCoder:`. If the operation was encoded while paused or still executing, its archived state will return `YES` for `isReady`. Otherwise, the state of an operation when encoding will remain unchanged.
+
+ ### NSCopying Caveats
+
+ - `-copy` and `-copyWithZone:` return a new operation with the `NSURLRequest` of the original. So rather than an exact copy of the operation at that particular instant, the copying mechanism returns a completely new instance, which can be useful for retrying operations.
+ - A copy of an operation will not include the `outputStream` of the original.
+ - Operation copies do not include `completionBlock`, as it often strongly captures a reference to `self`, which would otherwise have the unintuitive side-effect of pointing to the _original_ operation when copied.
+ */
+
+@interface AFURLConnectionOperation : NSOperation <NSURLConnectionDelegate, NSURLConnectionDataDelegate, NSSecureCoding, NSCopying>
+
+///-------------------------------
+/// @name Accessing Run Loop Modes
+///-------------------------------
+
+/**
+ The run loop modes in which the operation will run on the network thread. By default, this is a single-member set containing `NSRunLoopCommonModes`.
+ */
+@property (nonatomic, strong) NSSet *runLoopModes;
+
+///-----------------------------------------
+/// @name Getting URL Connection Information
+///-----------------------------------------
+
+/**
+ The request used by the operation's connection.
+ */
+@property (readonly, nonatomic, strong) NSURLRequest *request;
+
+/**
+ The last response received by the operation's connection.
+ */
+@property (readonly, nonatomic, strong) NSURLResponse *response;
+
+/**
+ The error, if any, that occurred in the lifecycle of the request.
+ */
+@property (readonly, nonatomic, strong) NSError *error;
+
+///----------------------------
+/// @name Getting Response Data
+///----------------------------
+
+/**
+ The data received during the request.
+ */
+@property (readonly, nonatomic, strong) NSData *responseData;
+
+/**
+ The string representation of the response data.
+ */
+@property (readonly, nonatomic, copy) NSString *responseString;
+
+/**
+ The string encoding of the response.
+
+ If the response does not specify a valid string encoding, `responseStringEncoding` will return `NSUTF8StringEncoding`.
+ */
+@property (readonly, nonatomic, assign) NSStringEncoding responseStringEncoding;
+
+///-------------------------------
+/// @name Managing URL Credentials
+///-------------------------------
+
+/**
+ Whether the URL connection should consult the credential storage for authenticating the connection. `YES` by default.
+
+ This is the value that is returned in the `NSURLConnectionDelegate` method `-connectionShouldUseCredentialStorage:`.
+ */
+@property (nonatomic, assign) BOOL shouldUseCredentialStorage;
+
+/**
+ The credential used for authentication challenges in `-connection:didReceiveAuthenticationChallenge:`.
+
+ This will be overridden by any shared credentials that exist for the username or password of the request URL, if present.
+ */
+@property (nonatomic, strong) NSURLCredential *credential;
+
+///-------------------------------
+/// @name Managing Security Policy
+///-------------------------------
+
+/**
+ The security policy used to evaluate server trust for secure connections.
+ */
+@property (nonatomic, strong) AFSecurityPolicy *securityPolicy;
+
+///------------------------
+/// @name Accessing Streams
+///------------------------
+
+/**
+ The input stream used to read data to be sent during the request.
+
+ This property acts as a proxy to the `HTTPBodyStream` property of `request`.
+ */
+@property (nonatomic, strong) NSInputStream *inputStream;
+
+/**
+ The output stream that is used to write data received until the request is finished.
+
+ By default, data is accumulated into a buffer that is stored into `responseData` upon completion of the request, with the intermediary `outputStream` property set to `nil`. When `outputStream` is set, the data will not be accumulated into an internal buffer, and as a result, the `responseData` property of the completed request will be `nil`. The output stream will be scheduled in the network thread runloop upon being set.
+ */
+@property (nonatomic, strong) NSOutputStream *outputStream;
+
+///---------------------------------
+/// @name Managing Callback Queues
+///---------------------------------
+
+/**
+ The dispatch queue for `completionBlock`. If `NULL` (default), the main queue is used.
+ */
+#if OS_OBJECT_HAVE_OBJC_SUPPORT
+@property (nonatomic, strong) dispatch_queue_t completionQueue;
+#else
+@property (nonatomic, assign) dispatch_queue_t completionQueue;
+#endif
+
+/**
+ The dispatch group for `completionBlock`. If `NULL` (default), a private dispatch group is used.
+ */
+#if OS_OBJECT_HAVE_OBJC_SUPPORT
+@property (nonatomic, strong) dispatch_group_t completionGroup;
+#else
+@property (nonatomic, assign) dispatch_group_t completionGroup;
+#endif
+
+///---------------------------------------------
+/// @name Managing Request Operation Information
+///---------------------------------------------
+
+/**
+ The user info dictionary for the receiver.
+ */
+@property (nonatomic, strong) NSDictionary *userInfo;
+
+///------------------------------------------------------
+/// @name Initializing an AFURLConnectionOperation Object
+///------------------------------------------------------
+
+/**
+ Initializes and returns a newly allocated operation object with a url connection configured with the specified url request.
+
+ This is the designated initializer.
+
+ @param urlRequest The request object to be used by the operation connection.
+ */
+- (instancetype)initWithRequest:(NSURLRequest *)urlRequest NS_DESIGNATED_INITIALIZER;
+
+///----------------------------------
+/// @name Pausing / Resuming Requests
+///----------------------------------
+
+/**
+ Pauses the execution of the request operation.
+
+ A paused operation returns `NO` for `-isReady`, `-isExecuting`, and `-isFinished`. As such, it will remain in an `NSOperationQueue` until it is either cancelled or resumed. Pausing a finished, cancelled, or paused operation has no effect.
+ */
+- (void)pause;
+
+/**
+ Whether the request operation is currently paused.
+
+ @return `YES` if the operation is currently paused, otherwise `NO`.
+ */
+- (BOOL)isPaused;
+
+/**
+ Resumes the execution of the paused request operation.
+
+ Pause/Resume behavior varies depending on the underlying implementation for the operation class. In its base implementation, resuming a paused requests restarts the original request. However, since HTTP defines a specification for how to request a specific content range, `AFHTTPRequestOperation` will resume downloading the request from where it left off, instead of restarting the original request.
+ */
+- (void)resume;
+
+///----------------------------------------------
+/// @name Configuring Backgrounding Task Behavior
+///----------------------------------------------
+
+/**
+ Specifies that the operation should continue execution after the app has entered the background, and the expiration handler for that background task.
+
+ @param handler A handler to be called shortly before the application’s remaining background time reaches 0. The handler is wrapped in a block that cancels the operation, and cleans up and marks the end of execution, unlike the `handler` parameter in `UIApplication -beginBackgroundTaskWithExpirationHandler:`, which expects this to be done in the handler itself. The handler is called synchronously on the main thread, thus blocking the application’s suspension momentarily while the application is notified.
+  */
+#if defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && !defined(AF_APP_EXTENSIONS)
+- (void)setShouldExecuteAsBackgroundTaskWithExpirationHandler:(void (^)(void))handler;
+#endif
+
+///---------------------------------
+/// @name Setting Progress Callbacks
+///---------------------------------
+
+/**
+ Sets a callback to be called when an undetermined number of bytes have been uploaded to the server.
+
+ @param block A block object to be called when an undetermined number of bytes have been uploaded to the server. This block has no return value and takes three arguments: the number of bytes written since the last time the upload progress block was called, the total bytes written, and the total bytes expected to be written during the request, as initially determined by the length of the HTTP body. This block may be called multiple times, and will execute on the main thread.
+ */
+- (void)setUploadProgressBlock:(void (^)(NSUInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite))block;
+
+/**
+ Sets a callback to be called when an undetermined number of bytes have been downloaded from the server.
+
+ @param block A block object to be called when an undetermined number of bytes have been downloaded from the server. This block has no return value and takes three arguments: the number of bytes read since the last time the download progress block was called, the total bytes read, and the total bytes expected to be read during the request, as initially determined by the expected content size of the `NSHTTPURLResponse` object. This block may be called multiple times, and will execute on the main thread.
+ */
+- (void)setDownloadProgressBlock:(void (^)(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead))block;
+
+///-------------------------------------------------
+/// @name Setting NSURLConnection Delegate Callbacks
+///-------------------------------------------------
+
+/**
+ Sets a block to be executed when the connection will authenticate a challenge in order to download its request, as handled by the `NSURLConnectionDelegate` method `connection:willSendRequestForAuthenticationChallenge:`.
+
+ @param block A block object to be executed when the connection will authenticate a challenge in order to download its request. The block has no return type and takes two arguments: the URL connection object, and the challenge that must be authenticated. This block must invoke one of the challenge-responder methods (NSURLAuthenticationChallengeSender protocol).
+
+ If `allowsInvalidSSLCertificate` is set to YES, `connection:willSendRequestForAuthenticationChallenge:` will attempt to have the challenge sender use credentials with invalid SSL certificates.
+ */
+- (void)setWillSendRequestForAuthenticationChallengeBlock:(void (^)(NSURLConnection *connection, NSURLAuthenticationChallenge *challenge))block;
+
+/**
+ Sets a block to be executed when the server redirects the request from one URL to another URL, or when the request URL changed by the `NSURLProtocol` subclass handling the request in order to standardize its format, as handled by the `NSURLConnectionDataDelegate` method `connection:willSendRequest:redirectResponse:`.
+
+ @param block A block object to be executed when the request URL was changed. The block returns an `NSURLRequest` object, the URL request to redirect, and takes three arguments: the URL connection object, the the proposed redirected request, and the URL response that caused the redirect.
+ */
+- (void)setRedirectResponseBlock:(NSURLRequest * (^)(NSURLConnection *connection, NSURLRequest *request, NSURLResponse *redirectResponse))block;
+
+
+/**
+ Sets a block to be executed to modify the response a connection will cache, if any, as handled by the `NSURLConnectionDelegate` method `connection:willCacheResponse:`.
+
+ @param block A block object to be executed to determine what response a connection will cache, if any. The block returns an `NSCachedURLResponse` object, the cached response to store in memory or `nil` to prevent the response from being cached, and takes two arguments: the URL connection object, and the cached response provided for the request.
+ */
+- (void)setCacheResponseBlock:(NSCachedURLResponse * (^)(NSURLConnection *connection, NSCachedURLResponse *cachedResponse))block;
+
+///
+
+/**
+
+ */
++ (NSArray *)batchOfRequestOperations:(NSArray *)operations
+                        progressBlock:(void (^)(NSUInteger numberOfFinishedOperations, NSUInteger totalNumberOfOperations))progressBlock
+                      completionBlock:(void (^)(NSArray *operations))completionBlock;
+
+@end
+
+///--------------------
+/// @name Notifications
+///--------------------
+
+/**
+ Posted when an operation begins executing.
+ */
+extern NSString * const AFNetworkingOperationDidStartNotification;
+
+/**
+ Posted when an operation finishes.
+ */
+extern NSString * const AFNetworkingOperationDidFinishNotification;

+// AFURLConnectionOperation.m
+// Copyright (c) 2011–2015 Alamofire Software Foundation (http://alamofire.org/)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#import "AFURLConnectionOperation.h"
+
+#if defined(__IPHONE_OS_VERSION_MIN_REQUIRED)
+#import <UIKit/UIKit.h>
+#endif
+
+#if !__has_feature(objc_arc)
+#error AFNetworking must be built with ARC.
+// You can turn on ARC for only AFNetworking files by adding -fobjc-arc to the build phase for each of its files.
+#endif
+
+typedef NS_ENUM(NSInteger, AFOperationState) {
+    AFOperationPausedState      = -1,
+    AFOperationReadyState       = 1,
+    AFOperationExecutingState   = 2,
+    AFOperationFinishedState    = 3,
+};
+
+#if defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && !defined(AF_APP_EXTENSIONS)
+typedef UIBackgroundTaskIdentifier AFBackgroundTaskIdentifier;
+#else
+typedef id AFBackgroundTaskIdentifier;
+#endif
+
+static dispatch_group_t url_request_operation_completion_group() {
+    static dispatch_group_t af_url_request_operation_completion_group;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        af_url_request_operation_completion_group = dispatch_group_create();
+    });
+
+    return af_url_request_operation_completion_group;
+}
+
+static dispatch_queue_t url_request_operation_completion_queue() {
+    static dispatch_queue_t af_url_request_operation_completion_queue;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        af_url_request_operation_completion_queue = dispatch_queue_create("com.alamofire.networking.operation.queue", DISPATCH_QUEUE_CONCURRENT );
+    });
+
+    return af_url_request_operation_completion_queue;
+}
+
+static NSString * const kAFNetworkingLockName = @"com.alamofire.networking.operation.lock";
+
+NSString * const AFNetworkingOperationDidStartNotification = @"com.alamofire.networking.operation.start";
+NSString * const AFNetworkingOperationDidFinishNotification = @"com.alamofire.networking.operation.finish";
+
+typedef void (^AFURLConnectionOperationProgressBlock)(NSUInteger bytes, long long totalBytes, long long totalBytesExpected);
+typedef void (^AFURLConnectionOperationAuthenticationChallengeBlock)(NSURLConnection *connection, NSURLAuthenticationChallenge *challenge);
+typedef NSCachedURLResponse * (^AFURLConnectionOperationCacheResponseBlock)(NSURLConnection *connection, NSCachedURLResponse *cachedResponse);
+typedef NSURLRequest * (^AFURLConnectionOperationRedirectResponseBlock)(NSURLConnection *connection, NSURLRequest *request, NSURLResponse *redirectResponse);
+
+static inline NSString * AFKeyPathFromOperationState(AFOperationState state) {
+    switch (state) {
+        case AFOperationReadyState:
+            return @"isReady";
+        case AFOperationExecutingState:
+            return @"isExecuting";
+        case AFOperationFinishedState:
+            return @"isFinished";
+        case AFOperationPausedState:
+            return @"isPaused";
+        default: {
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunreachable-code"
+            return @"state";
+#pragma clang diagnostic pop
+        }
+    }
+}
+
+static inline BOOL AFStateTransitionIsValid(AFOperationState fromState, AFOperationState toState, BOOL isCancelled) {
+    switch (fromState) {
+        case AFOperationReadyState:
+            switch (toState) {
+                case AFOperationPausedState:
+                case AFOperationExecutingState:
+                    return YES;
+                case AFOperationFinishedState:
+                    return isCancelled;
+                default:
+                    return NO;
+            }
+        case AFOperationExecutingState:
+            switch (toState) {
+                case AFOperationPausedState:
+                case AFOperationFinishedState:
+                    return YES;
+                default:
+                    return NO;
+            }
+        case AFOperationFinishedState:
+            return NO;
+        case AFOperationPausedState:
+            return toState == AFOperationReadyState;
+        default: {
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunreachable-code"
+            switch (toState) {
+                case AFOperationPausedState:
+                case AFOperationReadyState:
+                case AFOperationExecutingState:
+                case AFOperationFinishedState:
+                    return YES;
+                default:
+                    return NO;
+            }
+        }
+#pragma clang diagnostic pop
+    }
+}
+
+@interface AFURLConnectionOperation ()
+@property (readwrite, nonatomic, assign) AFOperationState state;
+@property (readwrite, nonatomic, strong) NSRecursiveLock *lock;
+@property (readwrite, nonatomic, strong) NSURLConnection *connection;
+@property (readwrite, nonatomic, strong) NSURLRequest *request;
+@property (readwrite, nonatomic, strong) NSURLResponse *response;
+@property (readwrite, nonatomic, strong) NSError *error;
+@property (readwrite, nonatomic, strong) NSData *responseData;
+@property (readwrite, nonatomic, copy) NSString *responseString;
+@property (readwrite, nonatomic, assign) NSStringEncoding responseStringEncoding;
+@property (readwrite, nonatomic, assign) long long totalBytesRead;
+@property (readwrite, nonatomic, assign) AFBackgroundTaskIdentifier backgroundTaskIdentifier;
+@property (readwrite, nonatomic, copy) AFURLConnectionOperationProgressBlock uploadProgress;
+@property (readwrite, nonatomic, copy) AFURLConnectionOperationProgressBlock downloadProgress;
+@property (readwrite, nonatomic, copy) AFURLConnectionOperationAuthenticationChallengeBlock authenticationChallenge;
+@property (readwrite, nonatomic, copy) AFURLConnectionOperationCacheResponseBlock cacheResponse;
+@property (readwrite, nonatomic, copy) AFURLConnectionOperationRedirectResponseBlock redirectResponse;
+
+- (void)operationDidStart;
+- (void)finish;
+- (void)cancelConnection;
+@end
+
+@implementation AFURLConnectionOperation
+@synthesize outputStream = _outputStream;
+
++ (void)networkRequestThreadEntryPoint:(id)__unused object {
+    @autoreleasepool {
+        [[NSThread currentThread] setName:@"AFNetworking"];
+
+        NSRunLoop *runLoop = [NSRunLoop currentRunLoop];
+        [runLoop addPort:[NSMachPort port] forMode:NSDefaultRunLoopMode];
+        [runLoop run];
+    }
+}
+
++ (NSThread *)networkRequestThread {
+    static NSThread *_networkRequestThread = nil;
+    static dispatch_once_t oncePredicate;
+    dispatch_once(&oncePredicate, ^{
+        _networkRequestThread = [[NSThread alloc] initWithTarget:self selector:@selector(networkRequestThreadEntryPoint:) object:nil];
+        [_networkRequestThread start];
+    });
+
+    return _networkRequestThread;
+}
+
+- (instancetype)initWithRequest:(NSURLRequest *)urlRequest {
+    NSParameterAssert(urlRequest);
+
+    self = [super init];
+    if (!self) {
+		return nil;
+    }
+
+    _state = AFOperationReadyState;
+
+    self.lock = [[NSRecursiveLock alloc] init];
+    self.lock.name = kAFNetworkingLockName;
+
+    self.runLoopModes = [NSSet setWithObject:NSRunLoopCommonModes];
+
+    self.request = urlRequest;
+
+    self.shouldUseCredentialStorage = YES;
+
+    self.securityPolicy = [AFSecurityPolicy defaultPolicy];
+
+    return self;
+}
+
+- (void)dealloc {
+    if (_outputStream) {
+        [_outputStream close];
+        _outputStream = nil;
+    }
+
+#if defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && !defined(AF_APP_EXTENSIONS)
+    if (_backgroundTaskIdentifier) {
+        [[UIApplication sharedApplication] endBackgroundTask:_backgroundTaskIdentifier];
+        _backgroundTaskIdentifier = UIBackgroundTaskInvalid;
+    }
+#endif
+}
+
+#pragma mark -
+
+- (void)setResponseData:(NSData *)responseData {
+    [self.lock lock];
+    if (!responseData) {
+        _responseData = nil;
+    } else {
+        _responseData = [NSData dataWithBytes:responseData.bytes length:responseData.length];
+    }
+    [self.lock unlock];
+}
+
+- (NSString *)responseString {
+    [self.lock lock];
+    if (!_responseString && self.response && self.responseData) {
+        self.responseString = [[NSString alloc] initWithData:self.responseData encoding:self.responseStringEncoding];
+    }
+    [self.lock unlock];
+
+    return _responseString;
+}
+
+- (NSStringEncoding)responseStringEncoding {
+    [self.lock lock];
+    if (!_responseStringEncoding && self.response) {
+        NSStringEncoding stringEncoding = NSUTF8StringEncoding;
+        if (self.response.textEncodingName) {
+            CFStringEncoding IANAEncoding = CFStringConvertIANACharSetNameToEncoding((__bridge CFStringRef)self.response.textEncodingName);
+            if (IANAEncoding != kCFStringEncodingInvalidId) {
+                stringEncoding = CFStringConvertEncodingToNSStringEncoding(IANAEncoding);
+            }
+        }
+
+        self.responseStringEncoding = stringEncoding;
+    }
+    [self.lock unlock];
+
+    return _responseStringEncoding;
+}
+
+- (NSInputStream *)inputStream {
+    return self.request.HTTPBodyStream;
+}
+
+- (void)setInputStream:(NSInputStream *)inputStream {
+    NSMutableURLRequest *mutableRequest = [self.request mutableCopy];
+    mutableRequest.HTTPBodyStream = inputStream;
+    self.request = mutableRequest;
+}
+
+- (NSOutputStream *)outputStream {
+    if (!_outputStream) {
+        self.outputStream = [NSOutputStream outputStreamToMemory];
+    }
+
+    return _outputStream;
+}
+
+- (void)setOutputStream:(NSOutputStream *)outputStream {
+    [self.lock lock];
+    if (outputStream != _outputStream) {
+        if (_outputStream) {
+            [_outputStream close];
+        }
+
+        _outputStream = outputStream;
+    }
+    [self.lock unlock];
+}
+
+#if defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && !defined(AF_APP_EXTENSIONS)
+- (void)setShouldExecuteAsBackgroundTaskWithExpirationHandler:(void (^)(void))handler {
+    [self.lock lock];
+    if (!self.backgroundTaskIdentifier) {
+        UIApplication *application = [UIApplication sharedApplication];
+        __weak __typeof(self)weakSelf = self;
+        self.backgroundTaskIdentifier = [application beginBackgroundTaskWithExpirationHandler:^{
+            __strong __typeof(weakSelf)strongSelf = weakSelf;
+
+            if (handler) {
+                handler();
+            }
+
+            if (strongSelf) {
+                [strongSelf cancel];
+
+                [application endBackgroundTask:strongSelf.backgroundTaskIdentifier];
+                strongSelf.backgroundTaskIdentifier = UIBackgroundTaskInvalid;
+            }
+        }];
+    }
+    [self.lock unlock];
+}
+#endif
+
+#pragma mark -
+
+- (void)setState:(AFOperationState)state {
+    if (!AFStateTransitionIsValid(self.state, state, [self isCancelled])) {
+        return;
+    }
+
+    [self.lock lock];
+    NSString *oldStateKey = AFKeyPathFromOperationState(self.state);
+    NSString *newStateKey = AFKeyPathFromOperationState(state);
+
+    [self willChangeValueForKey:newStateKey];
+    [self willChangeValueForKey:oldStateKey];
+    _state = state;
+    [self didChangeValueForKey:oldStateKey];
+    [self didChangeValueForKey:newStateKey];
+    [self.lock unlock];
+}
+
+- (void)pause {
+    if ([self isPaused] || [self isFinished] || [self isCancelled]) {
+        return;
+    }
+
+    [self.lock lock];
+    if ([self isExecuting]) {
+        [self performSelector:@selector(operationDidPause) onThread:[[self class] networkRequestThread] withObject:nil waitUntilDone:NO modes:[self.runLoopModes allObjects]];
+
+        dispatch_async(dispatch_get_main_queue(), ^{
+            NSNotificationCenter *notificationCenter = [NSNotificationCenter defaultCenter];
+            [notificationCenter postNotificationName:AFNetworkingOperationDidFinishNotification object:self];
+        });
+    }
+
+    self.state = AFOperationPausedState;
+    [self.lock unlock];
+}
+
+- (void)operationDidPause {
+    [self.lock lock];
+    [self.connection cancel];
+    [self.lock unlock];
+}
+
+- (BOOL)isPaused {
+    return self.state == AFOperationPausedState;
+}
+
+- (void)resume {
+    if (![self isPaused]) {
+        return;
+    }
+
+    [self.lock lock];
+    self.state = AFOperationReadyState;
+
+    [self start];
+    [self.lock unlock];
+}
+
+#pragma mark -
+
+- (void)setUploadProgressBlock:(void (^)(NSUInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite))block {
+    self.uploadProgress = block;
+}
+
+- (void)setDownloadProgressBlock:(void (^)(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead))block {
+    self.downloadProgress = block;
+}
+
+- (void)setWillSendRequestForAuthenticationChallengeBlock:(void (^)(NSURLConnection *connection, NSURLAuthenticationChallenge *challenge))block {
+    self.authenticationChallenge = block;
+}
+
+- (void)setCacheResponseBlock:(NSCachedURLResponse * (^)(NSURLConnection *connection, NSCachedURLResponse *cachedResponse))block {
+    self.cacheResponse = block;
+}
+
+- (void)setRedirectResponseBlock:(NSURLRequest * (^)(NSURLConnection *connection, NSURLRequest *request, NSURLResponse *redirectResponse))block {
+    self.redirectResponse = block;
+}
+
+#pragma mark - NSOperation
+
+- (void)setCompletionBlock:(void (^)(void))block {
+    [self.lock lock];
+    if (!block) {
+        [super setCompletionBlock:nil];
+    } else {
+        __weak __typeof(self)weakSelf = self;
+        [super setCompletionBlock:^ {
+            __strong __typeof(weakSelf)strongSelf = weakSelf;
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wgnu"
+            dispatch_group_t group = strongSelf.completionGroup ?: url_request_operation_completion_group();
+            dispatch_queue_t queue = strongSelf.completionQueue ?: dispatch_get_main_queue();
+#pragma clang diagnostic pop
+
+            dispatch_group_async(group, queue, ^{
+                block();
+            });
+
+            dispatch_group_notify(group, url_request_operation_completion_queue(), ^{
+                [strongSelf setCompletionBlock:nil];
+            });
+        }];
+    }
+    [self.lock unlock];
+}
+
+- (BOOL)isReady {
+    return self.state == AFOperationReadyState && [super isReady];
+}
+
+- (BOOL)isExecuting {
+    return self.state == AFOperationExecutingState;
+}
+
+- (BOOL)isFinished {
+    return self.state == AFOperationFinishedState;
+}
+
+- (BOOL)isConcurrent {
+    return YES;
+}
+
+- (void)start {
+    [self.lock lock];
+    if ([self isCancelled]) {
+        [self performSelector:@selector(cancelConnection) onThread:[[self class] networkRequestThread] withObject:nil waitUntilDone:NO modes:[self.runLoopModes allObjects]];
+    } else if ([self isReady]) {
+        self.state = AFOperationExecutingState;
+
+        [self performSelector:@selector(operationDidStart) onThread:[[self class] networkRequestThread] withObject:nil waitUntilDone:NO modes:[self.runLoopModes allObjects]];
+    }
+    [self.lock unlock];
+}
+
+- (void)operationDidStart {
+    [self.lock lock];
+    if (![self isCancelled]) {
+        self.connection = [[NSURLConnection alloc] initWithRequest:self.request delegate:self startImmediately:NO];
+
+        NSRunLoop *runLoop = [NSRunLoop currentRunLoop];
+        for (NSString *runLoopMode in self.runLoopModes) {
+            [self.connection scheduleInRunLoop:runLoop forMode:runLoopMode];
+            [self.outputStream scheduleInRunLoop:runLoop forMode:runLoopMode];
+        }
+
+        [self.outputStream open];
+        [self.connection start];
+    }
+    [self.lock unlock];
+
+    dispatch_async(dispatch_get_main_queue(), ^{
+        [[NSNotificationCenter defaultCenter] postNotificationName:AFNetworkingOperationDidStartNotification object:self];
+    });
+}
+
+- (void)finish {
+    [self.lock lock];
+    self.state = AFOperationFinishedState;
+    [self.lock unlock];
+
+    dispatch_async(dispatch_get_main_queue(), ^{
+        [[NSNotificationCenter defaultCenter] postNotificationName:AFNetworkingOperationDidFinishNotification object:self];
+    });
+}
+
+- (void)cancel {
+    [self.lock lock];
+    if (![self isFinished] && ![self isCancelled]) {
+        [super cancel];
+
+        if ([self isExecuting]) {
+            [self performSelector:@selector(cancelConnection) onThread:[[self class] networkRequestThread] withObject:nil waitUntilDone:NO modes:[self.runLoopModes allObjects]];
+        }
+    }
+    [self.lock unlock];
+}
+
+- (void)cancelConnection {
+    NSDictionary *userInfo = nil;
+    if ([self.request URL]) {
+        userInfo = [NSDictionary dictionaryWithObject:[self.request URL] forKey:NSURLErrorFailingURLErrorKey];
+    }
+    NSError *error = [NSError errorWithDomain:NSURLErrorDomain code:NSURLErrorCancelled userInfo:userInfo];
+
+    if (![self isFinished]) {
+        if (self.connection) {
+            [self.connection cancel];
+            [self performSelector:@selector(connection:didFailWithError:) withObject:self.connection withObject:error];
+        } else {
+            // Accomodate race condition where `self.connection` has not yet been set before cancellation
+            self.error = error;
+            [self finish];
+        }
+    }
+}
+
+#pragma mark -
+
++ (NSArray *)batchOfRequestOperations:(NSArray *)operations
+                        progressBlock:(void (^)(NSUInteger numberOfFinishedOperations, NSUInteger totalNumberOfOperations))progressBlock
+                      completionBlock:(void (^)(NSArray *operations))completionBlock
+{
+    if (!operations || [operations count] == 0) {
+        return @[[NSBlockOperation blockOperationWithBlock:^{
+            dispatch_async(dispatch_get_main_queue(), ^{
+                if (completionBlock) {
+                    completionBlock(@[]);
+                }
+            });
+        }]];
+    }
+
+    __block dispatch_group_t group = dispatch_group_create();
+    NSBlockOperation *batchedOperation = [NSBlockOperation blockOperationWithBlock:^{
+        dispatch_group_notify(group, dispatch_get_main_queue(), ^{
+            if (completionBlock) {
+                completionBlock(operations);
+            }
+        });
+    }];
+
+    for (AFURLConnectionOperation *operation in operations) {
+        operation.completionGroup = group;
+        void (^originalCompletionBlock)(void) = [operation.completionBlock copy];
+        __weak __typeof(operation)weakOperation = operation;
+        operation.completionBlock = ^{
+            __strong __typeof(weakOperation)strongOperation = weakOperation;
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wgnu"
+            dispatch_queue_t queue = strongOperation.completionQueue ?: dispatch_get_main_queue();
+#pragma clang diagnostic pop
+            dispatch_group_async(group, queue, ^{
+                if (originalCompletionBlock) {
+                    originalCompletionBlock();
+                }
+
+                NSUInteger numberOfFinishedOperations = [[operations indexesOfObjectsPassingTest:^BOOL(id op, NSUInteger __unused idx,  BOOL __unused *stop) {
+                    return [op isFinished];
+                }] count];
+
+                if (progressBlock) {
+                    progressBlock(numberOfFinishedOperations, [operations count]);
+                }
+
+                dispatch_group_leave(group);
+            });
+        };
+
+        dispatch_group_enter(group);
+        [batchedOperation addDependency:operation];
+    }
+
+    return [operations arrayByAddingObject:batchedOperation];
+}
+
+#pragma mark - NSObject
+
+- (NSString *)description {
+    [self.lock lock];
+    NSString *description = [NSString stringWithFormat:@"<%@: %p, state: %@, cancelled: %@ request: %@, response: %@>", NSStringFromClass([self class]), self, AFKeyPathFromOperationState(self.state), ([self isCancelled] ? @"YES" : @"NO"), self.request, self.response];
+    [self.lock unlock];
+    return description;
+}
+
+#pragma mark - NSURLConnectionDelegate
+
+- (void)connection:(NSURLConnection *)connection
+willSendRequestForAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge
+{
+    if (self.authenticationChallenge) {
+        self.authenticationChallenge(connection, challenge);
+        return;
+    }
+
+    if ([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]) {
+        if ([self.securityPolicy evaluateServerTrust:challenge.protectionSpace.serverTrust forDomain:challenge.protectionSpace.host]) {
+            NSURLCredential *credential = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust];
+            [[challenge sender] useCredential:credential forAuthenticationChallenge:challenge];
+        } else {
+            [[challenge sender] cancelAuthenticationChallenge:challenge];
+        }
+    } else {
+        if ([challenge previousFailureCount] == 0) {
+            if (self.credential) {
+                [[challenge sender] useCredential:self.credential forAuthenticationChallenge:challenge];
+            } else {
+                [[challenge sender] continueWithoutCredentialForAuthenticationChallenge:challenge];
+            }
+        } else {
+            [[challenge sender] continueWithoutCredentialForAuthenticationChallenge:challenge];
+        }
+    }
+}
+
+- (BOOL)connectionShouldUseCredentialStorage:(NSURLConnection __unused *)connection {
+    return self.shouldUseCredentialStorage;
+}
+
+- (NSURLRequest *)connection:(NSURLConnection *)connection
+             willSendRequest:(NSURLRequest *)request
+            redirectResponse:(NSURLResponse *)redirectResponse
+{
+    if (self.redirectResponse) {
+        return self.redirectResponse(connection, request, redirectResponse);
+    } else {
+        return request;
+    }
+}
+
+- (void)connection:(NSURLConnection __unused *)connection
+   didSendBodyData:(NSInteger)bytesWritten
+ totalBytesWritten:(NSInteger)totalBytesWritten
+totalBytesExpectedToWrite:(NSInteger)totalBytesExpectedToWrite
+{
+    dispatch_async(dispatch_get_main_queue(), ^{
+        if (self.uploadProgress) {
+            self.uploadProgress((NSUInteger)bytesWritten, totalBytesWritten, totalBytesExpectedToWrite);
+        }
+    });
+}
+
+- (void)connection:(NSURLConnection __unused *)connection
+didReceiveResponse:(NSURLResponse *)response
+{
+    self.response = response;
+}
+
+- (void)connection:(NSURLConnection __unused *)connection
+    didReceiveData:(NSData *)data
+{
+    NSUInteger length = [data length];
+    while (YES) {
+        NSInteger totalNumberOfBytesWritten = 0;
+        if ([self.outputStream hasSpaceAvailable]) {
+            const uint8_t *dataBuffer = (uint8_t *)[data bytes];
+
+            NSInteger numberOfBytesWritten = 0;
+            while (totalNumberOfBytesWritten < (NSInteger)length) {
+                numberOfBytesWritten = [self.outputStream write:&dataBuffer[(NSUInteger)totalNumberOfBytesWritten] maxLength:(length - (NSUInteger)totalNumberOfBytesWritten)];
+                if (numberOfBytesWritten == -1) {
+                    break;
+                }
+
+                totalNumberOfBytesWritten += numberOfBytesWritten;
+            }
+
+            break;
+        }
+
+        if (self.outputStream.streamError) {
+            [self.connection cancel];
+            [self performSelector:@selector(connection:didFailWithError:) withObject:self.connection withObject:self.outputStream.streamError];
+            return;
+        }
+    }
+
+    dispatch_async(dispatch_get_main_queue(), ^{
+        self.totalBytesRead += (long long)length;
+
+        if (self.downloadProgress) {
+            self.downloadProgress(length, self.totalBytesRead, self.response.expectedContentLength);
+        }
+    });
+}
+
+- (void)connectionDidFinishLoading:(NSURLConnection __unused *)connection {
+    self.responseData = [self.outputStream propertyForKey:NSStreamDataWrittenToMemoryStreamKey];
+
+    [self.outputStream close];
+    if (self.responseData) {
+       self.outputStream = nil;
+    }
+
+    self.connection = nil;
+
+    [self finish];
+}
+
+- (void)connection:(NSURLConnection __unused *)connection
+  didFailWithError:(NSError *)error
+{
+    self.error = error;
+
+    [self.outputStream close];
+    if (self.responseData) {
+        self.outputStream = nil;
+    }
+
+    self.connection = nil;
+
+    [self finish];
+}
+
+- (NSCachedURLResponse *)connection:(NSURLConnection *)connection
+                  willCacheResponse:(NSCachedURLResponse *)cachedResponse
+{
+    if (self.cacheResponse) {
+        return self.cacheResponse(connection, cachedResponse);
+    } else {
+        if ([self isCancelled]) {
+            return nil;
+        }
+
+        return cachedResponse;
+    }
+}
+
+#pragma mark - NSSecureCoding
+
++ (BOOL)supportsSecureCoding {
+    return YES;
+}
+
+- (id)initWithCoder:(NSCoder *)decoder {
+    NSURLRequest *request = [decoder decodeObjectOfClass:[NSURLRequest class] forKey:NSStringFromSelector(@selector(request))];
+
+    self = [self initWithRequest:request];
+    if (!self) {
+        return nil;
+    }
+
+    self.state = [[decoder decodeObjectOfClass:[NSNumber class] forKey:NSStringFromSelector(@selector(state))] integerValue];
+    self.response = [decoder decodeObjectOfClass:[NSHTTPURLResponse class] forKey:NSStringFromSelector(@selector(response))];
+    self.error = [decoder decodeObjectOfClass:[NSError class] forKey:NSStringFromSelector(@selector(error))];
+    self.responseData = [decoder decodeObjectOfClass:[NSData class] forKey:NSStringFromSelector(@selector(responseData))];
+    self.totalBytesRead = [[decoder decodeObjectOfClass:[NSNumber class] forKey:NSStringFromSelector(@selector(totalBytesRead))] longLongValue];
+
+    return self;
+}
+
+- (void)encodeWithCoder:(NSCoder *)coder {
+    [self pause];
+
+    [coder encodeObject:self.request forKey:NSStringFromSelector(@selector(request))];
+
+    switch (self.state) {
+        case AFOperationExecutingState:
+        case AFOperationPausedState:
+            [coder encodeInteger:AFOperationReadyState forKey:NSStringFromSelector(@selector(state))];
+            break;
+        default:
+            [coder encodeInteger:self.state forKey:NSStringFromSelector(@selector(state))];
+            break;
+    }
+
+    [coder encodeObject:self.response forKey:NSStringFromSelector(@selector(response))];
+    [coder encodeObject:self.error forKey:NSStringFromSelector(@selector(error))];
+    [coder encodeObject:self.responseData forKey:NSStringFromSelector(@selector(responseData))];
+    [coder encodeInt64:self.totalBytesRead forKey:NSStringFromSelector(@selector(totalBytesRead))];
+}
+
+#pragma mark - NSCopying
+
+- (id)copyWithZone:(NSZone *)zone {
+    AFURLConnectionOperation *operation = [(AFURLConnectionOperation *)[[self class] allocWithZone:zone] initWithRequest:self.request];
+
+    operation.uploadProgress = self.uploadProgress;
+    operation.downloadProgress = self.downloadProgress;
+    operation.authenticationChallenge = self.authenticationChallenge;
+    operation.cacheResponse = self.cacheResponse;
+    operation.redirectResponse = self.redirectResponse;
+    operation.completionQueue = self.completionQueue;
+    operation.completionGroup = self.completionGroup;
+
+    return operation;
+}
+
+@end

+// AFURLRequestSerialization.h
+// Copyright (c) 2011–2015 Alamofire Software Foundation (http://alamofire.org/)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#import <Foundation/Foundation.h>
+#if defined(__IPHONE_OS_VERSION_MIN_REQUIRED)
+#import <UIKit/UIKit.h>
+#endif
+
+/**
+ The `AFURLRequestSerialization` protocol is adopted by an object that encodes parameters for a specified HTTP requests. Request serializers may encode parameters as query strings, HTTP bodies, setting the appropriate HTTP header fields as necessary.
+
+ For example, a JSON request serializer may set the HTTP body of the request to a JSON representation, and set the `Content-Type` HTTP header field value to `application/json`.
+ */
+@protocol AFURLRequestSerialization <NSObject, NSSecureCoding, NSCopying>
+
+/**
+ Returns a request with the specified parameters encoded into a copy of the original request.
+
+ @param request The original request.
+ @param parameters The parameters to be encoded.
+ @param error The error that occurred while attempting to encode the request parameters.
+
+ @return A serialized request.
+ */
+- (NSURLRequest *)requestBySerializingRequest:(NSURLRequest *)request
+                               withParameters:(id)parameters
+                                        error:(NSError * __autoreleasing *)error;
+
+@end
+
+#pragma mark -
+
+/**
+
+ */
+typedef NS_ENUM(NSUInteger, AFHTTPRequestQueryStringSerializationStyle) {
+    AFHTTPRequestQueryStringDefaultStyle = 0,
+};
+
+@protocol AFMultipartFormData;
+
+/**
+ `AFHTTPRequestSerializer` conforms to the `AFURLRequestSerialization` & `AFURLResponseSerialization` protocols, offering a concrete base implementation of query string / URL form-encoded parameter serialization and default request headers, as well as response status code and content type validation.
+
+ Any request or response serializer dealing with HTTP is encouraged to subclass `AFHTTPRequestSerializer` in order to ensure consistent default behavior.
+ */
+@interface AFHTTPRequestSerializer : NSObject <AFURLRequestSerialization>
+
+/**
+ The string encoding used to serialize parameters. `NSUTF8StringEncoding` by default.
+ */
+@property (nonatomic, assign) NSStringEncoding stringEncoding;
+
+/**
+ Whether created requests can use the device’s cellular radio (if present). `YES` by default.
+
+ @see NSMutableURLRequest -setAllowsCellularAccess:
+ */
+@property (nonatomic, assign) BOOL allowsCellularAccess;
+
+/**
+ The cache policy of created requests. `NSURLRequestUseProtocolCachePolicy` by default.
+
+ @see NSMutableURLRequest -setCachePolicy:
+ */
+@property (nonatomic, assign) NSURLRequestCachePolicy cachePolicy;
+
+/**
+ Whether created requests should use the default cookie handling. `YES` by default.
+
+ @see NSMutableURLRequest -setHTTPShouldHandleCookies:
+ */
+@property (nonatomic, assign) BOOL HTTPShouldHandleCookies;
+
+/**
+ Whether created requests can continue transmitting data before receiving a response from an earlier transmission. `NO` by default
+
+ @see NSMutableURLRequest -setHTTPShouldUsePipelining:
+ */
+@property (nonatomic, assign) BOOL HTTPShouldUsePipelining;
+
+/**
+ The network service type for created requests. `NSURLNetworkServiceTypeDefault` by default.
+
+ @see NSMutableURLRequest -setNetworkServiceType:
+ */
+@property (nonatomic, assign) NSURLRequestNetworkServiceType networkServiceType;
+
+/**
+ The timeout interval, in seconds, for created requests. The default timeout interval is 60 seconds.
+
+ @see NSMutableURLRequest -setTimeoutInterval:
+ */
+@property (nonatomic, assign) NSTimeInterval timeoutInterval;
+
+///---------------------------------------
+/// @name Configuring HTTP Request Headers
+///---------------------------------------
+
+/**
+ Default HTTP header field values to be applied to serialized requests. By default, these include the following:
+
+ - `Accept-Language` with the contents of `NSLocale +preferredLanguages`
+ - `User-Agent` with the contents of various bundle identifiers and OS designations
+
+ @discussion To add or remove default request headers, use `setValue:forHTTPHeaderField:`.
+ */
+@property (readonly, nonatomic, strong) NSDictionary *HTTPRequestHeaders;
+
+/**
+ Creates and returns a serializer with default configuration.
+ */
++ (instancetype)serializer;
+
+/**
+ Sets the value for the HTTP headers set in request objects made by the HTTP client. If `nil`, removes the existing value for that header.
+
+ @param field The HTTP header to set a default value for
+ @param value The value set as default for the specified header, or `nil`
+ */
+- (void)setValue:(NSString *)value
+forHTTPHeaderField:(NSString *)field;
+
+/**
+ Returns the value for the HTTP headers set in the request serializer.
+
+ @param field The HTTP header to retrieve the default value for
+
+ @return The value set as default for the specified header, or `nil`
+ */
+- (NSString *)valueForHTTPHeaderField:(NSString *)field;
+
+/**
+ Sets the "Authorization" HTTP header set in request objects made by the HTTP client to a basic authentication value with Base64-encoded username and password. This overwrites any existing value for this header.
+
+ @param username The HTTP basic auth username
+ @param password The HTTP basic auth password
+ */
+- (void)setAuthorizationHeaderFieldWithUsername:(NSString *)username
+                                       password:(NSString *)password;
+
+/**
+ @deprecated This method has been deprecated. Use -setValue:forHTTPHeaderField: instead.
+ */
+- (void)setAuthorizationHeaderFieldWithToken:(NSString *)token DEPRECATED_ATTRIBUTE;
+
+
+/**
+ Clears any existing value for the "Authorization" HTTP header.
+ */
+- (void)clearAuthorizationHeader;
+
+///-------------------------------------------------------
+/// @name Configuring Query String Parameter Serialization
+///-------------------------------------------------------
+
+/**
+ HTTP methods for which serialized requests will encode parameters as a query string. `GET`, `HEAD`, and `DELETE` by default.
+ */
+@property (nonatomic, strong) NSSet *HTTPMethodsEncodingParametersInURI;
+
+/**
+ Set the method of query string serialization according to one of the pre-defined styles.
+
+ @param style The serialization style.
+
+ @see AFHTTPRequestQueryStringSerializationStyle
+ */
+- (void)setQueryStringSerializationWithStyle:(AFHTTPRequestQueryStringSerializationStyle)style;
+
+/**
+ Set the a custom method of query string serialization according to the specified block.
+
+ @param block A block that defines a process of encoding parameters into a query string. This block returns the query string and takes three arguments: the request, the parameters to encode, and the error that occurred when attempting to encode parameters for the given request.
+ */
+- (void)setQueryStringSerializationWithBlock:(NSString * (^)(NSURLRequest *request, id parameters, NSError * __autoreleasing *error))block;
+
+///-------------------------------
+/// @name Creating Request Objects
+///-------------------------------
+
+/**
+ @deprecated This method has been deprecated. Use -requestWithMethod:URLString:parameters:error: instead.
+ */
+- (NSMutableURLRequest *)requestWithMethod:(NSString *)method
+                                 URLString:(NSString *)URLString
+                                parameters:(id)parameters DEPRECATED_ATTRIBUTE;
+
+/**
+ Creates an `NSMutableURLRequest` object with the specified HTTP method and URL string.
+
+ If the HTTP method is `GET`, `HEAD`, or `DELETE`, the parameters will be used to construct a url-encoded query string that is appended to the request's URL. Otherwise, the parameters will be encoded according to the value of the `parameterEncoding` property, and set as the request body.
+
+ @param method The HTTP method for the request, such as `GET`, `POST`, `PUT`, or `DELETE`. This parameter must not be `nil`.
+ @param URLString The URL string used to create the request URL.
+ @param parameters The parameters to be either set as a query string for `GET` requests, or the request HTTP body.
+ @param error The error that occured while constructing the request.
+
+ @return An `NSMutableURLRequest` object.
+ */
+- (NSMutableURLRequest *)requestWithMethod:(NSString *)method
+                                 URLString:(NSString *)URLString
+                                parameters:(id)parameters
+                                     error:(NSError * __autoreleasing *)error;
+
+/**
+ @deprecated This method has been deprecated. Use -multipartFormRequestWithMethod:URLString:parameters:constructingBodyWithBlock:error: instead.
+ */
+- (NSMutableURLRequest *)multipartFormRequestWithMethod:(NSString *)method
+                                              URLString:(NSString *)URLString
+                                             parameters:(NSDictionary *)parameters
+                              constructingBodyWithBlock:(void (^)(id <AFMultipartFormData> formData))block DEPRECATED_ATTRIBUTE;
+
+/**
+ Creates an `NSMutableURLRequest` object with the specified HTTP method and URLString, and constructs a `multipart/form-data` HTTP body, using the specified parameters and multipart form data block. See http://www.w3.org/TR/html4/interact/forms.html#h-17.13.4.2
+
+ Multipart form requests are automatically streamed, reading files directly from disk along with in-memory data in a single HTTP body. The resulting `NSMutableURLRequest` object has an `HTTPBodyStream` property, so refrain from setting `HTTPBodyStream` or `HTTPBody` on this request object, as it will clear out the multipart form body stream.
+
+ @param method The HTTP method for the request. This parameter must not be `GET` or `HEAD`, or `nil`.
+ @param URLString The URL string used to create the request URL.
+ @param parameters The parameters to be encoded and set in the request HTTP body.
+ @param block A block that takes a single argument and appends data to the HTTP body. The block argument is an object adopting the `AFMultipartFormData` protocol.
+ @param error The error that occured while constructing the request.
+
+ @return An `NSMutableURLRequest` object
+ */
+- (NSMutableURLRequest *)multipartFormRequestWithMethod:(NSString *)method
+                                              URLString:(NSString *)URLString
+                                             parameters:(NSDictionary *)parameters
+                              constructingBodyWithBlock:(void (^)(id <AFMultipartFormData> formData))block
+                                                  error:(NSError * __autoreleasing *)error;
+
+/**
+ Creates an `NSMutableURLRequest` by removing the `HTTPBodyStream` from a request, and asynchronously writing its contents into the specified file, invoking the completion handler when finished.
+
+ @param request The multipart form request. The `HTTPBodyStream` property of `request` must not be `nil`.
+ @param fileURL The file URL to write multipart form contents to.
+ @param handler A handler block to execute.
+
+ @discussion There is a bug in `NSURLSessionTask` that causes requests to not send a `Content-Length` header when streaming contents from an HTTP body, which is notably problematic when interacting with the Amazon S3 webservice. As a workaround, this method takes a request constructed with `multipartFormRequestWithMethod:URLString:parameters:constructingBodyWithBlock:error:`, or any other request with an `HTTPBodyStream`, writes the contents to the specified file and returns a copy of the original request with the `HTTPBodyStream` property set to `nil`. From here, the file can either be passed to `AFURLSessionManager -uploadTaskWithRequest:fromFile:progress:completionHandler:`, or have its contents read into an `NSData` that's assigned to the `HTTPBody` property of the request.
+
+ @see https://github.com/AFNetworking/AFNetworking/issues/1398
+ */
+- (NSMutableURLRequest *)requestWithMultipartFormRequest:(NSURLRequest *)request
+                             writingStreamContentsToFile:(NSURL *)fileURL
+                                       completionHandler:(void (^)(NSError *error))handler;
+
+@end
+
+#pragma mark -
+
+/**
+ The `AFMultipartFormData` protocol defines the methods supported by the parameter in the block argument of `AFHTTPRequestSerializer -multipartFormRequestWithMethod:URLString:parameters:constructingBodyWithBlock:`.
+ */
+@protocol AFMultipartFormData
+
+/**
+ Appends the HTTP header `Content-Disposition: file; filename=#{generated filename}; name=#{name}"` and `Content-Type: #{generated mimeType}`, followed by the encoded file data and the multipart form boundary.
+
+ The filename and MIME type for this data in the form will be automatically generated, using the last path component of the `fileURL` and system associated MIME type for the `fileURL` extension, respectively.
+
+ @param fileURL The URL corresponding to the file whose content will be appended to the form. This parameter must not be `nil`.
+ @param name The name to be associated with the specified data. This parameter must not be `nil`.
+ @param error If an error occurs, upon return contains an `NSError` object that describes the problem.
+
+ @return `YES` if the file data was successfully appended, otherwise `NO`.
+ */
+- (BOOL)appendPartWithFileURL:(NSURL *)fileURL
+                         name:(NSString *)name
+                        error:(NSError * __autoreleasing *)error;
+
+/**
+ Appends the HTTP header `Content-Disposition: file; filename=#{filename}; name=#{name}"` and `Content-Type: #{mimeType}`, followed by the encoded file data and the multipart form boundary.
+
+ @param fileURL The URL corresponding to the file whose content will be appended to the form. This parameter must not be `nil`.
+ @param name The name to be associated with the specified data. This parameter must not be `nil`.
+ @param fileName The file name to be used in the `Content-Disposition` header. This parameter must not be `nil`.
+ @param mimeType The declared MIME type of the file data. This parameter must not be `nil`.
+ @param error If an error occurs, upon return contains an `NSError` object that describes the problem.
+
+ @return `YES` if the file data was successfully appended otherwise `NO`.
+ */
+- (BOOL)appendPartWithFileURL:(NSURL *)fileURL
+                         name:(NSString *)name
+                     fileName:(NSString *)fileName
+                     mimeType:(NSString *)mimeType
+                        error:(NSError * __autoreleasing *)error;
+
+/**
+ Appends the HTTP header `Content-Disposition: file; filename=#{filename}; name=#{name}"` and `Content-Type: #{mimeType}`, followed by the data from the input stream and the multipart form boundary.
+
+ @param inputStream The input stream to be appended to the form data
+ @param name The name to be associated with the specified input stream. This parameter must not be `nil`.
+ @param fileName The filename to be associated with the specified input stream. This parameter must not be `nil`.
+ @param length The length of the specified input stream in bytes.
+ @param mimeType The MIME type of the specified data. (For example, the MIME type for a JPEG image is image/jpeg.) For a list of valid MIME types, see http://www.iana.org/assignments/media-types/. This parameter must not be `nil`.
+ */
+- (void)appendPartWithInputStream:(NSInputStream *)inputStream
+                             name:(NSString *)name
+                         fileName:(NSString *)fileName
+                           length:(int64_t)length
+                         mimeType:(NSString *)mimeType;
+
+/**
+ Appends the HTTP header `Content-Disposition: file; filename=#{filename}; name=#{name}"` and `Content-Type: #{mimeType}`, followed by the encoded file data and the multipart form boundary.
+
+ @param data The data to be encoded and appended to the form data.
+ @param name The name to be associated with the specified data. This parameter must not be `nil`.
+ @param fileName The filename to be associated with the specified data. This parameter must not be `nil`.
+ @param mimeType The MIME type of the specified data. (For example, the MIME type for a JPEG image is image/jpeg.) For a list of valid MIME types, see http://www.iana.org/assignments/media-types/. This parameter must not be `nil`.
+ */
+- (void)appendPartWithFileData:(NSData *)data
+                          name:(NSString *)name
+                      fileName:(NSString *)fileName
+                      mimeType:(NSString *)mimeType;
+
+/**
+ Appends the HTTP headers `Content-Disposition: form-data; name=#{name}"`, followed by the encoded data and the multipart form boundary.
+
+ @param data The data to be encoded and appended to the form data.
+ @param name The name to be associated with the specified data. This parameter must not be `nil`.
+ */
+
+- (void)appendPartWithFormData:(NSData *)data
+                          name:(NSString *)name;
+
+
+/**
+ Appends HTTP headers, followed by the encoded data and the multipart form boundary.
+
+ @param headers The HTTP headers to be appended to the form data.
+ @param body The data to be encoded and appended to the form data. This parameter must not be `nil`.
+ */
+- (void)appendPartWithHeaders:(NSDictionary *)headers
+                         body:(NSData *)body;
+
+/**
+ Throttles request bandwidth by limiting the packet size and adding a delay for each chunk read from the upload stream.
+
+ When uploading over a 3G or EDGE connection, requests may fail with "request body stream exhausted". Setting a maximum packet size and delay according to the recommended values (`kAFUploadStream3GSuggestedPacketSize` and `kAFUploadStream3GSuggestedDelay`) lowers the risk of the input stream exceeding its allocated bandwidth. Unfortunately, there is no definite way to distinguish between a 3G, EDGE, or LTE connection over `NSURLConnection`. As such, it is not recommended that you throttle bandwidth based solely on network reachability. Instead, you should consider checking for the "request body stream exhausted" in a failure block, and then retrying the request with throttled bandwidth.
+
+ @param numberOfBytes Maximum packet size, in number of bytes. The default packet size for an input stream is 16kb.
+ @param delay Duration of delay each time a packet is read. By default, no delay is set.
+ */
+- (void)throttleBandwidthWithPacketSize:(NSUInteger)numberOfBytes
+                                  delay:(NSTimeInterval)delay;
+
+@end
+
+#pragma mark -
+
+/**
+ `AFJSONRequestSerializer` is a subclass of `AFHTTPRequestSerializer` that encodes parameters as JSON using `NSJSONSerialization`, setting the `Content-Type` of the encoded request to `application/json`.
+ */
+@interface AFJSONRequestSerializer : AFHTTPRequestSerializer
+
+/**
+ Options for writing the request JSON data from Foundation objects. For possible values, see the `NSJSONSerialization` documentation section "NSJSONWritingOptions". `0` by default.
+ */
+@property (nonatomic, assign) NSJSONWritingOptions writingOptions;
+
+/**
+ Creates and returns a JSON serializer with specified reading and writing options.
+
+ @param writingOptions The specified JSON writing options.
+ */
++ (instancetype)serializerWithWritingOptions:(NSJSONWritingOptions)writingOptions;
+
+@end
+
+#pragma mark -
+
+/**
+ `AFPropertyListRequestSerializer` is a subclass of `AFHTTPRequestSerializer` that encodes parameters as JSON using `NSPropertyListSerializer`, setting the `Content-Type` of the encoded request to `application/x-plist`.
+ */
+@interface AFPropertyListRequestSerializer : AFHTTPRequestSerializer
+
+/**
+ The property list format. Possible values are described in "NSPropertyListFormat".
+ */
+@property (nonatomic, assign) NSPropertyListFormat format;
+
+/**
+ @warning The `writeOptions` property is currently unused.
+ */
+@property (nonatomic, assign) NSPropertyListWriteOptions writeOptions;
+
+/**
+ Creates and returns a property list serializer with a specified format, read options, and write options.
+
+ @param format The property list format.
+ @param writeOptions The property list write options.
+
+ @warning The `writeOptions` property is currently unused.
+ */
++ (instancetype)serializerWithFormat:(NSPropertyListFormat)format
+                        writeOptions:(NSPropertyListWriteOptions)writeOptions;
+
+@end
+
+#pragma mark -
+
+///----------------
+/// @name Constants
+///----------------
+
+/**
+ ## Error Domains
+
+ The following error domain is predefined.
+
+ - `NSString * const AFURLRequestSerializationErrorDomain`
+
+ ### Constants
+
+ `AFURLRequestSerializationErrorDomain`
+ AFURLRequestSerializer errors. Error codes for `AFURLRequestSerializationErrorDomain` correspond to codes in `NSURLErrorDomain`.
+ */
+extern NSString * const AFURLRequestSerializationErrorDomain;
+
+/**
+ ## User info dictionary keys
+
+ These keys may exist in the user info dictionary, in addition to those defined for NSError.
+
+ - `NSString * const AFNetworkingOperationFailingURLRequestErrorKey`
+
+ ### Constants
+
+ `AFNetworkingOperationFailingURLRequestErrorKey`
+ The corresponding value is an `NSURLRequest` containing the request of the operation associated with an error. This key is only present in the `AFURLRequestSerializationErrorDomain`.
+ */
+extern NSString * const AFNetworkingOperationFailingURLRequestErrorKey;
+
+/**
+ ## Throttling Bandwidth for HTTP Request Input Streams
+
+ @see -throttleBandwidthWithPacketSize:delay:
+
+ ### Constants
+
+ `kAFUploadStream3GSuggestedPacketSize`
+ Maximum packet size, in number of bytes. Equal to 16kb.
+
+ `kAFUploadStream3GSuggestedDelay`
+ Duration of delay each time a packet is read. Equal to 0.2 seconds.
+ */
+extern NSUInteger const kAFUploadStream3GSuggestedPacketSize;
+extern NSTimeInterval const kAFUploadStream3GSuggestedDelay;