response_map.put( request, response );
                doSend( request );
                response.expiration = System.currentTimeMillis() + timeout;
                while (!response.isReceived) {
                    wait( timeout );
                    timeout = response.expiration - System.currentTimeMillis();
                    if (timeout <= 0) {
                        throw new TransportException( name +

            long k = makeKey(curReq);

            if ( firstKey == 0 ) {
                firstKey = k;
            }

            if ( timeout > 0 ) {
                curResp.setExpiration(System.currentTimeMillis() + timeout);
            }
            else {
                curResp.setExpiration(null);
            }

            curResp.setMid(k);
            this.response_map.put(k, curResp);