Error when calling MvcHttpHandler.ExecuteRequest from custom IHttpHandler
.net-4.0, asp.net-mvc-4, ihttphandler
Solution
I believe you need to use `httpContext.Server.TransferRequest` with the MVC update.
See this question: MVC3 Application Inside Webforms Application Routing is throwing a HttpContext.SetSessionStateBehavior Error in IIS7.5
Problem
I have a custom IHttpHandler that calls MvcHttpHandler implemented as described in this answer. It worked well in asp.net MVC2, but after I migrate the code to MVC4 with IISExpress 7.5, I start getting InvalidOperationException on the line: ``` httpHandler.ProcessRequest(HttpContext.Current); ``` with message: 'HttpContext.SetSessionStateBehavior' can only be invoked before 'HttpApplication.AcquireRequestState' event is raised. ASP.NET Development Server does not make any problems. Does anyone know what's going on here, and how to solve it?