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    <p>Ok, answering my own questin.</p> <p>After looking into this issue and researching a bit more I found that when a web-app is protected by Forms-Authentication and the user is <strong>not authenticated</strong>, this is what happens:</p> <ul> <li>If it's a GET-request - the user is redirected to the login page.</li> <li>If it's a POST-request to a page - the user is redirected to the login page.</li> <li>If it's a POST-request <strong>to a web-service</strong> - the user gets 401-unauthorized</li> </ul> <p>Thats how ASP.NET works</p> <p>And if a web-service is called by AJAX (xmlHttpRequest object) and returns 401 - of course the browser shows a pop-up login box.</p> <p>Now, what should you do is add some code to Application_PostAuthenticateRequest that will prevent throwing 401 for webservices.</p> <pre><code>protected void Application_PostAuthenticateRequest(Object sender, EventArgs e) { if (Request.RequestType == "POST" //if its POST &amp;&amp; !User.Identity.IsAuthenticated //if user NOT authed &amp;&amp; !HasAnonymousAccess(Context) //if it's not the login page ) { //lets get the auth type Configuration config = WebConfigurationManager.OpenWebConfiguration("~"); SystemWebSectionGroup grp = (SystemWebSectionGroup)config.GetSectionGroup("system.web"); AuthenticationSection auth = grp.Authentication; //if it FORMS auth if(auth.Mode== AuthenticationMode.Forms) { //then redirect... this redirect won't work for AJAX cause xmlHttpRequest can't handle redirects, but anyway... Response.Redirect(FormsAuthentication.LoginUrl, true); Response.End(); } } } public static bool HasAnonymousAccess(HttpContext context) { return UrlAuthorizationModule.CheckUrlAccessForPrincipal( context.Request.Path, new GenericPrincipal(new GenericIdentity(string.Empty), null), context.Request.HttpMethod); } </code></pre>
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    1. CO@jazbit, can you point to some doucmentation which talks about the 401 status code for web services, i have a scenario where i am checking for session ecpiry and am doing a redirect which results 401 to the client
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