public void TryConnectByHttpRequest() ??????? { ??????????? HttpWebRequest httpReq = null; ??????????? try ??????????? { ??????????????? if (!string.IsNullOrEmpty(this.servUrl)) ??????????????? { ??????????????????? string param = "test1=zh-CN&test2=request"; ??????????????????? byte[] data = Encoding.ASCII.GetBytes(param); ? ??????????????????? httpReq = (HttpWebRequest)HttpWebRequest.Create(this.servUrl); ??????????????????? httpReq.Method = "POST";//不用Post用Get某些Http服務會報錯：遠程服務器返回錯誤: (411) 所需的長度。 ??????????????????? httpReq.ContentType = "application/x-www-form-urlencoded;charset=gb2312"; ??????????????????? httpReq.ContentLength = data.Length; ??????????????????? //忽略緩存，完全使用服務器滿足請求 ??????????????????? httpReq.CachePolicy = new RequestCachePolicy(RequestCacheLevel.NoCacheNoStore); ??????????????????? //響應延時為4S ??????????????????? httpReq.Timeout = 4000; ??????????????????? //這個在Post的時候，一定要加上，如果服務器返回錯誤，他還會繼續再去請求，不會使用之前的錯誤數據，做返回數據 ??????????????????? httpReq.ServicePoint.Expect100Continue = false; ??????????????????? httpReq.ServicePoint.ConnectionLimit = 500; ? ??????????????????? using (Stream reqStream = httpReq.GetRequestStream()) ??????????????????? { ??????????????????????? reqStream.Write(data, 0, data.Length); ??????????????????? } ? ??????????????????? IAsyncResult result = httpReq.BeginGetResponse(new AsyncCallback(RespCallback), httpReq); ? ??????????????????? int DefaultTimeout = 2 * 60 * 1000; // 2 minutes timeout ??????????????????? ThreadPool.RegisterWaitForSingleObject(result.AsyncWaitHandle, new WaitOrTimerCallback(TimeoutCallback), httpReq, DefaultTimeout, true); ??????????????? } ??????????? } ??????????? catch (WebException ex) ??????????? { ??????????????? FrmMain.Instance.WriteClientLog("嘗試連接Web服務出現異常：" + ex.Message); ??????????? } ??????? } ? ??????? public void TryConnectByHttpRequestGet() ??????? { ??????????? HttpWebRequest httpReq = null; ??????????? try ??????????? { ??????????????? if (!string.IsNullOrEmpty(this.servUrl)) ??????????????? { ??????????????????? httpReq = (HttpWebRequest)HttpWebRequest.Create(this.servUrl); ??????????????????? httpReq.Method = "GET"; ??????????????????? httpReq.ContentType = "application/x-www-form-urlencoded;charset=gb2312"; ??????????????????? //忽略緩存，完全使用服務器滿足請求 ??????????????????? httpReq.CachePolicy = new RequestCachePolicy(RequestCacheLevel.NoCacheNoStore); ??????????????????? //響應延時為4S ??????????????????? httpReq.Timeout = 4000; ? ??????????????????? IAsyncResult result = httpReq.BeginGetResponse(new AsyncCallback(RespCallback), httpReq); ? ??????????????????? int DefaultTimeout = 2 * 60 * 1000; // 2 minutes timeout ??????????????????? ThreadPool.RegisterWaitForSingleObject(result.AsyncWaitHandle, new WaitOrTimerCallback(TimeoutCallback), httpReq, DefaultTimeout, true); ??????????????? } ??????????? } ??????????? catch (WebException ex) ??????????? { ??????????????? FrmMain.Instance.WriteClientLog("嘗試連接Web服務出現異常：" + ex.Message); ??????????? } ??????? } ? 上面寫的兩個方法分別是用的Post 和Get請求！ ? 客戶公司提供了HTTP服務 我用Post方法正常連通 Get方法異常:遠程服務器返回錯誤: (411) 所需的長度。 我自己用HttpListener寫的Http服務 我用Post方法異常：操作超時 Get方法正常連通。 ? 為啥會出現不同的情況啊？還有一般去請求HTTP到底是用Get還是Http啊？