Merge r1753228 from trunk:

httpoxy workarounds, first draft patch as published for all 2.2.x+ sources

Submitted by: Dominic Scheirlinck <dominic vendhq.com>, ylavic
Reviewed by: wrowe, rpluem, ylavic


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@1756564 13f79535-47bb-0310-9956-ffa450edef68