是否可以检测/重复使用这些设置?

如何 ?

我得到的例外是,这是连接到的例外 http://www.google.com

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 66.102.1.99:80

  at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, 
     SocketAddress socketAddress)
  at System.Net.Sockets.Socket.InternalConnect(EndPoint remoteEP)
  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 mvcTest.MvcApplication.Application_Start() in
     C:\\home\\test\\Application1\\Application1\\Program.cs:line 33"
有帮助吗?

解决方案

默认情况下,HTTPWebRequest实际上将使用IE代理设置。

如果你 想要使用它们,您必须专门覆盖为null(无代理)或您选择的代理设置的.proxy专有。

 HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://news.bbc.co.uk");
 //request.Proxy = null; // uncomment this to bypass the default (IE) proxy settings
 HttpWebResponse response = (HttpWebResponse)request.GetResponse();

 Console.WriteLine("Done - press return");
 Console.ReadLine();

其他提示

我得到的情况非常相似,默认情况下,httpwebrequest并未访问正确的代理详细信息,并且设置underefaultcredentials也无法使用。然而,强迫代码中的设置有所帮助:

IWebProxy proxy = myWebRequest.Proxy;
if (proxy != null) {
    string proxyuri = proxy.GetProxy(myWebRequest.RequestUri).ToString;
    myWebRequest.UseDefaultCredentials = true;
    myWebRequest.Proxy = new WebProxy(proxyuri, false);
    myWebRequest.Proxy.Credentials = System.Net.CredentialCache.DefaultCredentials;
}

而且由于这使用默认凭据,因此不应向用户询问其详细信息。

请注意,这是我在此处发布的答案的重复,出于一个非常相似的问题: c#中的代理基本身份验证:http 407错误

对于让ISA服务器播放的问题的人,您可能会尝试以以下方式设置代理:

IWebProxy webProxy = WebRequest.DefaultWebProxy;
webProxy.Credentials = CredentialCache.DefaultNetworkCredentials;
myRequest.Proxy = webProxy;

默认情况下,如果未明确设置WebRequest.proxy(默认情况下,将其设置为 WebRequest.DefaultWebProxy).

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