Merge r367798 from trunk:

Merge r367798 from trunk:

* Fix PR38017 by handling the selection of the hostname in the same way for
  non proxied and reverse proxied requests.

  We need to handle both cases in the same manner as for the reverse proxy
  case we have the following situation:

  If a cached entry is looked up by mod_cache's quick handler r->proxyreq
  is still unset in the reverse proxy case as it only gets set in the
  translate name hook (either by ProxyPass or mod_rewrite) which is run
  after the quick handler hook. This is different to the forward proxy
  case where it gets set before the quick handler is run (in the
  post_read_request hook).
  If a cache entry is created by the CACHE_SAVE filter we always have
  r->proxyreq set correctly.
  So we must ensure that in the reverse proxy case we use the same code
  path and using the canonical name seems to be the right thing to do
  in the reverse proxy case.

PR: 38017
Submitted by: rpluem
Reviewed by: rpluem, wrowe, colm

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@374931 13f79535-47bb-0310-9956-ffa450edef68