Re: Accessing cookies returned in error responses with httpwebrequest (.net CF)
From: Feroze [msft] (ferozed_at_online.microsoft.com)
Date: 10/22/04
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Date: Fri, 22 Oct 2004 11:41:23 -0700
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.
-- feroze ----------------- This posting is provided as-is. It offers no warranties and assigns no rights. See http://weblogs.asp.net/feroze_daud for System.Net related posts. ---------------- "Alex White" <lisaalexjade@yahoo.com.au> wrote in message news:bac0a66e.0410062342.9a20964@posting.google.com... > Hi, > > I'm currently developing an application on the ppc using the .NET > compact framework, using HttpWebRequest and HttpWebResponse in > asynchronous mode. > > I'm currently trying to authenticate (basic authentication) with a > site protected by third party security software, and the initial > request to the site returns a 401 (Access Denied). I can implement > authentication using the NetworkCredential class, assigning this to > the Credentials property. > > The problem is that the site uses cookies to track the user attempting > access, and the 401 response includes some cookies which need to be > passed back with the authentication details. Otherwise I cannot gain > access. > > We all know that the CF does not support cookies, and I've overcome > this problem in a different area by retrieving the important cookies & > reinserting them manually (using the Headers property of the response > and request), but when a 401 is returned from the site, I have no > HttpWebResponse object to poach them from. (The call to EndGetResponse > is supposed to return the HttpWebResponse object, but throws an > exception in the case of a 401). > > I have a test application that I can run in the conventional > framework, and I can replicate the problem by disabling the cookies. > The authentication works as soon as I set the cookie container. So I > know that the cookies are definitely the problem. > > Does anyone know how to access the headers returned in a server error > response? > > Cheers, > Alex.
- Next message: Ilya Tumanov [MS]: "RE: Help with error message concerning System.Data.IDbCommand"
- Previous message: chak: "signature capture, storage, and retrieval"
- In reply to: Alex White: "Accessing cookies returned in error responses with httpwebrequest (.net CF)"
- Messages sorted by: [ date ] [ thread ]
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