Fix support for Proxy Authentication (we were testing the response

status too early).

Submitted by:	Marc Slemko
Reviewed by:	Roy Fielding, Dean Gaudet


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@79338 13f79535-47bb-0310-9956-ffa450edef68