如何在.net HttpWebRequest中自动检测/使用IE代理设置

Question

是否可以检测/重用这些设置？

怎么样 ？

我得到的例外情况是这是连接到http://www.google.com时的例外情况

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"

Answer 1

HttpWebRequest实际上默认使用IE代理设置.

如果你不希望使用它们,你必须明确覆盖.Proxy proprty为null(无代理),或者你选择的代理设置.

 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();

Answer 2

我得到了一个非常类似的情况,默认情况下HttpWebRequest没有获取正确的代理详细信息,并且设置UseDefaultCredentials也不起作用.在代码中强制设置但是有用了:

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;
}

并且因为它使用默认凭据,所以不应该询问用户他们的详细信息.

请注意,这是我在此处发布的答案的副本,其中包含一个非常类似的问题:C#中的代理基本身份验证:HTTP 407错误