* Handle the cases "no proxy request" and "reverse proxy request" in the same

  manner, when setting scheme and port_str. This is needed because 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.
  Also set scheme to ap_http_scheme(r) instead of "http" to handle SSL
  correctly.

PR: 39593


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@407357 13f79535-47bb-0310-9956-ffa450edef68