Hosting ASP.NET InProc

I'm writing a very simple webserver which should be also available to windows xp
home.

I also implemented my own SimpleWorkerRequest and overwrote
SendKnownResponseHeader
 to get the headers which should be sent to the client but this method gets
never called when running


HttpRuntime.Process(wr);

while the html output is written nicely via SendResponseFromMemory.

But I need to send HttpHeaders, especially content-length and content-type to my
clients.

Can you give me a hint?

Thanks in Advance