* Do not remove the connection headers from r->headers_in. They are needed

  by the http output filter to create the correct connection response headers.
  Instead work on a copy of r->headers_in.

PR: 38524


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@377053 13f79535-47bb-0310-9956-ffa450edef68