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PO"cannot set status after HTTP headers" when overriding AuthorizeAttribute.AuthorizeCore
 

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  1. PO"cannot set status after HTTP headers" when overriding AuthorizeAttribute.AuthorizeCore
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    <p>I'm trying to implement custom basic authentication on specific controller of MVC 2 application. Specifically I inherited from <code>AuthorizeAttribute</code> and override <code>AuthorizeCore()</code> method:</p> <pre><code>protected override bool AuthorizeCore(HttpContextBase httpContext) { if( doAuthorization() ) { return true; } // send HTTP 401 HttpContext context = HttpContext.Current; context.Response.StatusCode = 401; context.Response.AddHeader( "WWW-Authenticate", String.Format("Basic realm=\"{0}\"", myRealm); context.Response.End(); return false; } </code></pre> <p>and marked the controller with my inherited attribute.</p> <p>The whole thing works, but whenever <code>AuthorizeCore</code> returns <code>false</code> MVC continues processing the request and <code>Application_Error()</code> is invoked and I retrieve the following exception there:</p> <pre><code>Server cannot set status after HTTP headers have been sent. at System.Web.HttpResponse.set_StatusCode(Int32 value) at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) at System.Web.Mvc.Controller.ExecuteCore() at System.Web.Mvc.MvcHandler.&lt;&gt;c__DisplayClass8.&lt;BeginProcessRequest&gt;b__4() at System.Web.Mvc.Async.AsyncResultWrapper.&lt;&gt;c__DisplayClass1.&lt;MakeVoidDelegate&gt;b__0() at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&amp; completedSynchronously) </code></pre> <p>How do I make MVC stop processing the request and prevent that exception?</p>
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