Hi,

Is there a way to access the headers inside error responses using httpwebrequest?

Cheers,
Alex.

If I understand you correctly, the handshake goes like this:

Client: GET to server
Server: 401, with Set-Cookie header & WWW-Authenticate header.
Client: GET to server, with Cookie, and Authorization header containing
credentials.

If so, you can try the following:

Do not set credential on the request. Issue a request to the server. You
will get back an exception. you can get headers from the response object by
doing the following:

   HttpWebResponse resp = null;
   string cookie = null;
   try {
       resp = req.GetResponse() as HttpWebResponse;
   } catch(WebException e) {
       if(e.Status == WebExceptionStatus.ProtocolError) {
           resp = e.Response as HttpWebResponse;
           if((int)resp.Status == 401) {
               cookie = resp.Headers["Set-Cookie"];
           }
           // optionally, get the response stream, read it & close it.
           resp.Close();
       }
   }

Once you get the cookie, you can set it on the next request, along with the
credentials.

   // next request.
   req = (HttpWebRequest)WebRequest.Create("...");
   req.Headers["Cookie"] = cookie;
   req.Credentials = new NetworkCredential(...);
   try {
       resp = req.GetResponse() as HttpWebRequest;
   } catch(...) {
       ...
   }

The key thing to note here is that the first request should not have the
credentials set on them. Otherwise the CF will try to do the auth handshake,
and since it doesnt support cookies, it will not succeed.