for( ;; ) {
            resolveDfs(request);
            try {
                tree.send( request, response );
                break;
            } catch( DfsReferral dre ) {
                if( dre.resolveHashes ) {
                    throw dre;
                }
                request.reset();
            }
        }
    }

    static String queryLookup( String query, String param ) {