How to AutoDetect/Use IE proxy settings in .net HttpWebRequest

c# proxy httpwebrequest detect
Kumar picture Kumar · Jul 20, 2009 · Viewed 41.7k times · Source

Is it possible to detect/reuse those settings ?

How ?

The exception i'm getting is This is the exception while connecting to 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"

Answer

Rob Levine picture Rob Levine · Jul 20, 2009

HttpWebRequest will actually use the IE proxy settings by default.

If you don't want to use them, you have to specifically override the .Proxy proprty to either null (no proxy), or the proxy settings of you choice.

 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();

Related questions

Proxy Basic Authentication in C#: HTTP 407 error

I am working with a proxy that requires authentication, i.e., in a browser if I try to open a page it will immediately ask for credentials. I supplied same credentials in my program but it fails with HTTP 407 error. …

Read More
How do I see the raw HTTP request that the HttpWebRequest class sends?

I know you are all going to answer "use a debugging proxy server like Fiddler" but it's not that simple. Here's my situation: I have some code that runs on a server, in an ASP.NET page code-behind (aspx.cs), …

Read More
using Tor as Proxy

I'm trying to use Tor-Server as a proxy in HttpWebRequest, my code looks like this: HttpWebRequest request; HttpWebResponse response; request = (HttpWebRequest)WebRequest.Create("http://www.google.com"); request.Proxy = new WebProxy("127.0.0.1:9051"); response = (HttpWebResponse)request.GetResponse(); response.Close(); it works perfect …

Read More