C#后端代码抓取页面偶发性与主机连接失败
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悬赏园豆：30
[待解决问题]
用 HttpWebResponse 抓取页面时链接主机失败，这种情况是偶然发生，网站自己用的按说并发性不会很高，有没有大侠知道什么原因嘛？
抓取代码：
HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(url);
HttpWebResponse httpResponse = (HttpWebResponse)httpRequest.GetResponse();
StreamReader sr = new StreamReader(httpResponse.GetResponseStream(), Encoding.UTF8);
String str = sr.ReadToEnd();
String appPath = AppDomain.CurrentDomain.SetupInformation.ApplicationBase.TrimEnd(Path.DirectorySeparatorChar);
sr.Close();
英文原文报错 ：
System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond
下面是翻译过来的：
System.Net.Sockets。SocketException:连接尝试失败，因为被连接方在一段时间后没有正确响应，或者建立的连接失败，因为连接的主机没有响应
所有回答(4)
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服务器不稳定吧~~ 你ping 一下看看。
添加了白名单，不允许ping
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==StatusCode=0
通常原因就是网络不通或者不存在该端口服务
正常浏览这个服务器的页面是可以浏览的，但是使用 HttpWebRequest.GetResponse() 抓取页面就会出现无法连接服务器的情况，而且是一点出现取法连接是接下来十几分钟内就都是无法连接状态，我在想的是会不会哪里堵了，下面是报错信息：
System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond
at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress)
at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception)
--- End of inner exception stack trace ---
at System.Net.HttpWebRequest.GetResponse()
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接口请求量大吗，是不是超出连接数限制了
访问量不到，有时候本地也会无法连接服务器，连接数设置 512
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尝试使用 RestSharp呢?
