Introduce the map_to_storage hook, which allows modules to bypass
  the directory_walk and file_walk for non-file requests.  TRACE
  shortcut moved to http_protocol.c as APR_HOOK_MIDDLE, and the
  directory_walk/file_walk happen as APR_HOOK_VERY_LAST in core.c.

  A seperate patch to mod_proxy is required to short circuit both the
  TRACE and directory_walk/file_walk stuff.  That patch is next.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@90665 13f79535-47bb-0310-9956-ffa450edef68