On the 2.4.x branch:

 Merged /httpd/httpd/trunk:r1784571,1785672,1785683,1786512,1786575-1786576
 mod_http2/mod_proxy_http2 backport



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1786582 13f79535-47bb-0310-9956-ffa450edef68