I can return a 401 error, and get the browser to bring up the authentication window, but I can't get the server to call the gateway afterward. I would like to have the HTTP server allow access to my gateway, and pass the authentication header onto the gateway app. Then my app would perform the user db look up in its own db. I heard that you could change the scheme from Basic to something unknown and the server would pass it along, but I haven't been able to make that happen with IIS. Is this possible?