session重置后，需要在请求的时候额外刷新header的session review by 尹诚

@@ -42,9 +42,8 @@ static NSString *const YH_HTTP_PREFIX = @"http://";
         self.httpClient.securityPolicy.allowInvalidCertificates = YES;
         self.httpClient.operationQueue.maxConcurrentOperationCount = 6;
         [self.httpClient.requestSerializer setValue:@"gzip" forHTTPHeaderField:@"Content-Encoding"];
-        if ([[YH_Analytics sharedInstance].session length] > 0) {
         [self.httpClient.requestSerializer setValue:[[YH_Analytics sharedInstance] session] forHTTPHeaderField:@"x-yoho-sid"];
-        }
+
         self.baiduManager = [AFHTTPRequestOperationManager manager];
         AFHTTPResponseSerializer *responseSerializer = [AFHTTPResponseSerializer serializer];
         responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"text/json", @"text/plain", @"text/html", @"text/xml", nil];
@@ -62,6 +61,11 @@ static NSString *const YH_HTTP_PREFIX = @"http://";
     self.httpClient = nil;
 }
 
+- (void)updateHttpClientRequestHTTPHeaderSid
+{
+    [self.httpClient.requestSerializer setValue:[[YH_Analytics sharedInstance] session] forHTTPHeaderField:@"x-yoho-sid"];
+}
+
 - (NSString *)checkHttpsPrefix:(NSString *)urlString
 {
     urlString = [self urlStringByTransformToHttpsProtocol:urlString];//进行http->https的转换
@@ -122,6 +126,8 @@ static NSString *const YH_HTTP_PREFIX = @"http://";
     
     NSString *url = [self checkHttpsPrefix:kURLAnalyticsService];
     
+    [self updateHttpClientRequestHTTPHeaderSid];
+    
     return [self.httpClient POST:url priority:NSOperationQueuePriorityLow parameters:newParameters success:^(AFHTTPRequestOperation *operation, id responseObject) {
         
         if (block) {
@@ -236,6 +242,8 @@ static NSString *const YH_HTTP_PREFIX = @"http://";
     
     url = [self checkHttpsPrefix:url];
     
+    [self updateHttpClientRequestHTTPHeaderSid];
+    
     return [self.httpClient POST:url priority:NSOperationQueuePriorityLow parameters:newParameters success:^(AFHTTPRequestOperation *operation, id responseObject) {
         
         if (block) {