RFC2396 allows the syntax http://host:/path (with no port number)

but the proxy disallowed it (ap_proxy_canon_netloc()).

PR:3530
Submitted by:	David Kristol <dmk@bell-labs.com>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@82541 13f79535-47bb-0310-9956-ffa450edef68