Split proposal for PR 53555 into smaller chunks

Replace jim's proposal into smaller chunks that are IMHO easier to review.

The end result is the same, except for the CHANGES entry and one comment that I
added to r1770752 vs. the Bugzilla patch and that was missing in jim's patch.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1770769 13f79535-47bb-0310-9956-ffa450edef68