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    <p>After hours of hassle with the code, I found out the issue.</p> <p>In my Visual Studio 2008, when I press Ctrl+F5, the Application Development Server is launched and IE is popped up to access "<a href="http://localhost:3573/" rel="nofollow noreferrer">http://localhost:3573/</a>". In this case, the sync API <strong><em>ProcessRequest</em></strong> is invoked. The stack trace is like this.</p> <blockquote> <blockquote> <p>MyMvcApplication.DLL!MyMvcApplication.AsyncMvcRouteHandler.AsyncMvcHandler.ProcessRequest(System.Web.HttpContext httpContext = {System.Web.HttpContext}) Line 59 C# System.Web.Mvc.dll!System.Web.Mvc.MvcHttpHandler.VerifyAndProcessRequest(System.Web.IHttpHandler httpHandler, System.Web.HttpContextBase httpContext) + 0x19 bytes<br> System.Web.Routing.dll!System.Web.Routing.UrlRoutingHandler.ProcessRequest(System.Web.HttpContextBase httpContext) + 0x66 bytes<br> System.Web.Routing.dll!System.Web.Routing.UrlRoutingHandler.ProcessRequest(System.Web.HttpContext httpContext) + 0x28 bytes<br> System.Web.Routing.dll!System.Web.Routing.UrlRoutingHandler.System.Web.IHttpHandler.ProcessRequest(System.Web.HttpContext context) + 0x8 bytes<br> MyMvcApplication.DLL!MyMvcApplication._Default.Page_Load(object sender = {ASP.default_aspx}, System.EventArgs e = {System.EventArgs}) Line 13 + 0x1a bytes C#</p> </blockquote> </blockquote> <p>However, when I change the URL in IE to be "<a href="http://localhost:3573/whatever.mvc" rel="nofollow noreferrer">http://localhost:3573/whatever.mvc</a>", it hits the <strong><em>BeginProcessRequest</em></strong>. The stack trace is like this.</p> <blockquote> <blockquote> <p>MyMvcApplication.DLL!MyMvcApplication.AsyncMvcRouteHandler.AsyncMvcHandler.BeginProcessRequest(System.Web.HttpContext context = {System.Web.HttpContext}, System.AsyncCallback cb = {Method = {Void OnAsyncHandlerCompletion(System.IAsyncResult)}}, object extraData = null) Line 66 C# System.Web.dll!System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() + 0x249 bytes System.Web.dll!System.Web.HttpApplication.ExecuteStep(System.Web.HttpApplication.IExecutionStep step = {System.Web.HttpApplication.CallHandlerExecutionStep}, ref bool completedSynchronously = true) + 0x9c bytes<br> System.Web.dll!System.Web.HttpApplication.ApplicationStepManager.ResumeSteps(System.Exception error) + 0x133 bytes<br> System.Web.dll!System.Web.HttpApplication.System.Web.IHttpAsyncHandler.BeginProcessRequest(System.Web.HttpContext context, System.AsyncCallback cb, object extraData) + 0x7c bytes<br> System.Web.dll!System.Web.HttpRuntime.ProcessRequestInternal(System.Web.HttpWorkerRequest wr = {Microsoft.VisualStudio.WebHost.Request}) + 0x17c bytes System.Web.dll!System.Web.HttpRuntime.ProcessRequestNoDemand(System.Web.HttpWorkerRequest wr) + 0x63 bytes<br> System.Web.dll!System.Web.HttpRuntime.ProcessRequest(System.Web.HttpWorkerRequest wr) + 0x47 bytes<br> WebDev.WebHost.dll!Microsoft.VisualStudio.WebHost.Request.Process() + 0xf1 bytes WebDev.WebHost.dll!Microsoft.VisualStudio.WebHost.Host.ProcessRequest(Microsoft.VisualStudio.WebHost.Connection conn) + 0x4e bytes</p> </blockquote> </blockquote> <p>It seems that only url with ".mvc" suffix can make asynchronous API invoked.</p>
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