Merge r1528556 from trunk:

  *) mod_rewrite: Make rewrite websocket aware to allow proxying.
     PR 55598. [Chris Harris <chris.harris kitware com>]

Submitted By: [Chris Harris <chris.harris kitware com>
Reviewed By: jim, rjung, covener



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1530032 13f79535-47bb-0310-9956-ffa450edef68