Take advantage of http.sys on Windows

On Windows, we should take advantage of the kernel-level HTTP server support. See

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/http/http/http_api_start_page.asp

This is useful where the client starts up an HTTP listener. It allows multiple clients to share a single port, with the kernel dispatching to the appropriate client based on the URL. See the "Why does it matter?" section of:

http://dotnetjunkies.com/Tutorial/99DD7042-532D-4DB4-8625-1CD8BF422D64.dcik