WebRequest 使用代理 Post 超时问题
多线程使用webrequest 使用代理访问  get 基本上没有超时现象，但是在post操作的时候总是超时异常！
这是对方服务器限制？还是我使用有误？

 byte[] data = encoding.GetBytes(rushdata);

            request = WebRequest.Create(PostUrl) as HttpWebRequest;//************ 

            request.Method = "POST";          

            request.ContentLength = rushdata.Length;

            request.Timeout = 20000;            

            request.Accept = "*/*";            

            request.Headers.Add("X-Requested-With", "XMLHttpRequest");

            request.UserAgent = UA;

            request.ContentType = "application/x-www-form-urlencoded";

            request.Referer = ReferUrl;           

            request.Headers.Add("Accept-Language", "zh-CN,zh;q=0.8");

            request.Headers.Add("Accept-Charset", "GBK,utf-8;q=0.7,*;q=0.3");          

            request.CookieContainer = PostCookie;           

            request.Proxy = new WebProxy(_ip, int.Parse(_port));//使用代理

            outstream = request.GetRequestStream();

            outstream.Write(data, 0, rushdata.Length);

            outstream.Close();

            response = request.GetResponse() as HttpWebResponse;

            instream = response.GetResponseStream();

            if (response.ContentEncoding != null && response.ContentEncoding.Equals("gzip", StringComparison.InvariantCultureIgnoreCase))

                sr = new StreamReader(new GZipStream(instream, CompressionMode.Decompress), encoding);

            else

                sr = new StreamReader(response.GetResponseStream(), encoding);

            content = sr.ReadToEnd();

------解决方案--------------------
应该是代理本身的问题