Add X-Forwarded-Host and X-Forwarded-Server to X-Forwarded-For

to the proxy.
PR:
Obtained from:
Submitted by:	Thomas Eibner <thomas@stderr.net>
Reviewed by:	Graham Leggett


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@95398 13f79535-47bb-0310-9956-ffa450edef68