jdMorgan - 10:45 pm on Dec 8, 2010 (gmt 0)
Not sure I understand this. Redirects don't use Content-Type headers, because a redirect response contains no response-body...
The content-type goes with the content -- the redirected-to 'page' or resource.
Also, I'm not sure why you are redirecting to the IIS server; this sounds like a job for a reverse-proxy, not a redirect.