Merge r1851093 from trunk

   * mod_proxy_wstunnel: Fix websocket proxy over UDS.

PR: 62932
Submitted by: <pavel dcmsys.com>
Reviewed by: jailletc36 (by inspection), jim, ylavic
Backported by: jailletc36

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1853654 13f79535-47bb-0310-9956-ffa450edef68