HttpWebRequest中GetResponse或者說GetRequestStream偶爾超時，或者是各種操作超時造成的假死的一些解決方案...

今天用了將近一天的時間來查找這個問題的存在，不停的百度查找原因測試原因，發現解決方案很是簡單，不過最好還好哦啊都解決了，在這里紀錄一下，希望可以幫到你們

 payload = System.Text.Encoding.UTF8.GetBytes(postDataStr);request.ContentLength = payload.Length;Stream writer = request.GetRequestStream();writer.Write(payload, 0, payload.Length);//writer.Flush();
                writer.Close();//HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                HttpWebResponse res;try{System.Net.ServicePointManager.DefaultConnectionLimit = 200;res = (HttpWebResponse)request.GetResponse();}catch (WebException ex){res = (HttpWebResponse)ex.Response;}

?今天我的res 一直報操作超時，百度了很多方案，一一測試，總結來說，如果你也出現了這種錯誤，可以一次嘗試一下方案

第一種：加長request的timeout的時間，默認是100秒（我就是測試了好多方案，才發現我的timeout的時間太短，引起的操作超時）

第二種：設置request.KeepAlive = false;原因是：默認KeepAlive的屬性是true，將此屬性設置為?true?以發送帶有?Keep-alive?值的?Connection?HTTP?標頭。?應用程序使用?KeepAlive?指示持久連接的首選項。?當?KeepAlive?屬性為?true?時，應用程序與支持它們的服務器建立持久連接。也要記住要及時關閉相對應的關閉工作

if (request != null){request.Abort();}if (res != null){res.Close();}

?

第三種：

System.Net.ServicePointManager.DefaultConnectionLimit = 200;

?加上這句話，因為這個默認設置的是2，當http的連接超過2條時，也會報這種操作超時的錯誤

第四種：

                System.GC.Collect();HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);request.Method = "POST";request.ContentType = "application/x-www-form-urlencoded";request.ContentLength = postDataStr.Length;request.KeepAlive = false;request.Timeout = 6000000;

?在

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);

?之前加上：System.GC.Collect();

原因是：系統中的http相關的資源沒有正確的釋放，導致后續的GetResponse或者說GetRequestStream超時死掉

?

? ? 改進之后的所有代碼：

public static bool HttpPost(string Url, string postDataStr, out string errMsg, out string returnData){try{System.GC.Collect();HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);request.Method = "POST";request.ContentType = "application/x-www-form-urlencoded";request.ContentLength = postDataStr.Length;request.KeepAlive = false;request.Timeout = 6000000;//StreamWriter writer = new StreamWriter(request.GetRequestStream(), Encoding.UTF8);//writer.Write(postDataStr);//writer.Flush();byte[] payload;payload = System.Text.Encoding.UTF8.GetBytes(postDataStr);request.ContentLength = payload.Length;Stream writer = request.GetRequestStream();writer.Write(payload, 0, payload.Length);//writer.Flush();
                writer.Close();//HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                HttpWebResponse res;try{System.Net.ServicePointManager.DefaultConnectionLimit = 200;res = (HttpWebResponse)request.GetResponse();}catch (WebException ex){res = (HttpWebResponse)ex.Response;}//StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);StreamReader reader = new StreamReader(res.GetResponseStream(), Encoding.UTF8);string retString = reader.ReadToEnd();errMsg = "";try{returnData = Util.base642Str(retString);}catch (Exception){returnData = retString;//throw;
                }if (request != null){request.Abort();}if (res != null){res.Close();}return true;}

?

? ? ? ? ? ? ? ? ? ? ? ?參考文章：https://www.cnblogs.com/wohexiaocai/p/5673193.html