* 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.

PR: 46949
Reviewed by: jim, wrowe


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@763394 13f79535-47bb-0310-9956-ffa450edef68