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    <p>I need to provide a clarification here to your second question:</p> <blockquote> <p>Question 2) Why is the code inside my Index() method of my HomeController gets executed after the OnAuthentication? Only to realize that after I return View() do the code inside the OnAuthenticationChallenge() gets executed?</p> </blockquote> <p>You should actually be testing for credentials in OnAuthentication if you want to prevent the user from executing the code in your action method. OnAuthenticationChallenge is your chance to handle the 401 with a custom result, such as redirecting the user to a custom controller/action and give them a chance to authenticate.</p> <pre><code>public class CustomAuthenticationAttribute : ActionFilterAttribute, IAuthenticationFilter { public void OnAuthentication(AuthenticationContext filterContext) { var user = filterContext.HttpContext.User; if (user == null || !user.Identity.IsAuthenticated) { filterContext.Result = new HttpUnauthorizedResult(); } } public void OnAuthenticationChallenge(AuthenticationChallengeContext filterContext) { // modify filterContext.Result to go somewhere special...if you do // nothing here they will just go to the site's default login } } </code></pre> <p>Here is a more complete run-through of the filter and how you might work with it: <a href="http://jameschambers.com/2013/11/working-with-iauthenticationfilter-in-the-mvc-5-framework/" rel="noreferrer">http://jameschambers.com/2013/11/working-with-iauthenticationfilter-in-the-mvc-5-framework/</a></p> <p>Cheers.</p>
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    1. POMVC 5.0 [AllowAnonymous] and the new IAuthenticationFilter
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    1. COIn my understanding `OnAuthentication()` must not decide to return `HttpUnauthorizedResult` - this is authorization.
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    2. CO@UserControl Where did you gain that understanding from? 401 Unauthorized is a poorly aligned term, but it's the way to say "you need different credentials than the ones you're presenting to access this resource". In fact the HTTP RFC says that the server response should be an authentication challenge for the specified resource. How does this not align?
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    3. COWell, it's quite clear for me "different credentials" means authorization, because once we can get *any* valid credentials we can answer the question who is who - exactly what authentication is supposed to do. And, if the credentials provided is not enough to perform some action it's definitely authorization issue (come back and give me *another valid* credentials).
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