Merge r763394 from trunk:

* Avoid delivering content from a previous request which failed to send a request
  body by closing the connection to the backend in this case instead of reusing it.

CVE: CVE-2009-1191 (cve.mitre.org)
PR: 46949
Submitted by: rpluem
Reviewed by: rpluem, wrowe, jfclere


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@768506 13f79535-47bb-0310-9956-ffa450edef68