灰度调整,删除gzip的http头

@@ -45,6 +45,7 @@ module.exports = function(proxyRoute) {
       }
       //删除提交内容长度，代理会改变长度
       delete options.headers['content-length'];
+      delete options.headers["accept-encoding"];
       //设置代理host
       options.headers['host'] = config.url.replace('http://','');
       if(!req.session.gray) {
@@ -56,13 +57,14 @@ module.exports = function(proxyRoute) {
       logger.log('info','grayroute: request options: %j',options,{});
 
       //发起代理请求
-      if(req.is('html')) { 
+      if(req.headers['accept'].indexOf('text/html')>-1) { 
         request(options,function(err,res,body) {
           if(err) {
             logger.log('error','grayroute: request error:',err);
             ress.status(500).send('');
           } else {
-            setGrayCookie(req,res);
+            var ContentType = res.caseless.get('Content-Type');
+            ress.append('Content-Type',ContentType);
             ress.status(res.statusCode).send(body);
           }
         });
@@ -85,19 +87,4 @@ module.exports = function(proxyRoute) {
       next();
     }
   }
- }
-
-  /**
-   * 灰度cookie设置
-   * @param {Object} req express request
-   * @param {Object} res request的响应
-   */
- function setGrayCookie(req,res) {
-    //cookie透传到老系统
-    var cookie = res.caseless.get('set-cookie');
-    //如果没有设置到session
-    if(cookie && cookie.length>0 && !req.session.gray) {
-      req.session.gray = cookie[0];
-    } 
-    return cookie;
  }
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