Merge r600645 from trunk:

http_protocol: Escape request method in 413 error reporting.
Determined to be not generally exploitable, but a flaw in any case.

PR: 44014
Submitted by: Victor Stinner <victor.stinner inl.fr>



Submitted by: wrowe
Reviewed by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@602473 13f79535-47bb-0310-9956-ffa450edef68