specified they want to use the CanonicalName, but they have not
configured a port with the ServerName, then use the same port that
the original request used.
Submitted by: Ryan Bloom and Ken Coar
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@93296 13f79535-47bb-0310-9956-ffa450edef68