.Net Web 请求 - 无法连接到远程服务器

Question

我正在使用 .Net Web Request 来读取所选网页的 html。

偶尔会出现以下错误：

2010-09-05 13:14:51,986 [File_29] ERROR Boxer.Classes.GetLinks [(null)] - HtmlUtils - GetResponse - Url - http://domain.com/index.html
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 69.212.110.118:5068
   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, Int32 timeout, Exception& exception)
   --- End of inner exception stack trace ---
   at System.Net.HttpWebRequest.GetResponse()
   at Boxer.Classes.GetLinks.GetResponse(String url, Int32 timeout, Boolean& timeoutException)

我确定目标 URL 可用。

知道错误的原因是什么吗？

Answer 1

发生这种情况可能有不同的原因。也许目标服务器正在限制响应，因为它认为请求来自机器人。在这种情况下，您可能会考虑发送正确的 HTTP 标头（如果它在您的浏览器中有效，请尝试发送相同的请求标头）。此外，您还可能需要配置和使用代理。