PR:

        /* Add X-Forwarded-For: so that the upstream has a chance to

         * determine, where the original request came from.

         */

        apr_table_mergen(r->headers_in, "X-Forwarded-For", r->connection->remote_ip);

        apr_table_setn(r->headers_in, "X-Forwarded-For", r->connection->remote_ip);

        /* Add X-Forwarded-Host: so that upstream knows what the

         * original request hostname was.

         */

        if ((buf = apr_table_get(r->headers_in, "Host"))) {

            apr_table_mergen(r->headers_in, "X-Forwarded-Host", buf);

            apr_table_setn(r->headers_in, "X-Forwarded-Host", buf);

        }

        /* Add X-Forwarded-Server: so that upstream knows what the

         * name of this proxy server is (if there are more than one)

         * XXX: This duplicates Via: - do we strictly need it?

         */

        apr_table_mergen(r->headers_in, "X-Forwarded-Server",

        apr_table_setn(r->headers_in, "X-Forwarded-Server",

                         r->server->server_hostname);

    }