Backport:

Backport:

  *) mod_proxy_connect: Honor the smallest of the backend or client timeout
     while tunneling, and handle "proxy-nohalfclose" as opt-out for hlaf-close
     tunneling. PR 65631, 65662, 65689.
     trunk patch: http://svn.apache.org/r1894290
                  http://svn.apache.org/r1895304
     backport PR: https://github.com/apache/httpd/pull/278
     2.4.x patch: https://patch-diff.githubusercontent.com/raw/apache/httpd/pull/278.patch
     +1: ylavic, rpluem, minfrin

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1895762 13f79535-47bb-0310-9956-ffa450edef68