* If we face a timeout during receiving the response from the backend and if

  we pinged it successfully before don't assume the whole backend has failed.
  Assume that only the request has failed and return a gateway timeout then.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1398307 13f79535-47bb-0310-9956-ffa450edef68