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

Answer 1

A:

This happens by default, if WebRequest.Proxy is null.

John Saunders 2009-07-20 19:19:06

doesn't look like it as it's throwing an exceptioncould there be a caveat perhaps

Kumar 2009-07-20 19:21:22

no - setting the WebRequest.Proxy to null bypasses all proxies. Leaving it "as is" lets it pick up the default proxy (it is not null by default).

Rob Levine 2009-07-20 19:24:00

@Kumar: post the full exception. @Rob: You're right. By default it's set to `WebRequest.DefaultWebProxy`.

John Saunders 2009-07-20 19:35:29

Answer 2

+2 A:

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();

Rob Levine 2009-07-20 19:21:05

doesn't look like itI'm actually using the recaptcha control which uses the HTTPWebRequest and throws an exception

Kumar 2009-07-20 19:22:40

it does behave as I say. You can demonstrate this using the above snippet of code and using Fiddler.See this answer from a related topic to see how to demostrate that this is the default behaviour:http://stackoverflow.com/questions/1112320/removing-obsolete-webproxy-getdefaultproxy-references/1112399#1112399

Rob Levine 2009-07-20 19:25:53

One caveat is that the default proxy settings are read from the registry on the application's startup. If you want them to be reloaded because they've changed, you must explicitly indicate that by setting the .Proxy property.

EricLaw -MSFT- 2009-07-21 14:42:20

Eric, what if the IE settings include a script? See http://stackoverflow.com/questions/1160683/whats-the-right-way-to-handle-a-proxy-autoconfig-script-to-make-a-webservice-cal if you get a chance.

John Saunders 2009-07-21 19:03:45

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