If we insert a protocol filter before we insert a request filter, we

must set the r->output_filter to r->proto_output_filter.  If we don't,
then as soon as we insert the request filter, the protocol filter will
be removed.  This was causing headers to not be sent on some requests.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@93692 13f79535-47bb-0310-9956-ffa450edef68