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"too many automatic redirections were attempted" error message when using a httpWebRequest in .NET

I am attempting to request a page like "http://www.google.com/?q=random" using the webrequest class in vb.net. we are behind a firewall, so we have to authenticate our requests. I have gotten past the authentication part by adding my credentials. But once that works it seems to go into a redirecting loop.

Does anyone have an ideas, comments, suggetions why this is? Has anyone else experienced this problem?

Dim loHttp As HttpWebRequest =  CType(WebRequest.Create(_url), HttpWebRequest)
loHttp.Timeout = 10000
loHttp.Method = "GET"
loHttp.KeepAlive = True
loHttp.AllowAutoRedirect = True
loHttp.PreAuthenticate = True
Dim _cred1 As NetworkCredential = ... //this is setup
//snip out this stuff
loHttp.Credentials = _cc
loWebResponse = loHttp.GetResponse()
Solution

  • Make sure you have a cookie container setup.

    CookieContainer cookieContainer = new CookieContainer();
loHttp.CookieContainer = cookieContainer;

    You are probably not saving cookies and getting caught in a redirect loop.