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?
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