Response curResp = response;
        Request curReq = request;
        long firstKey = 0;
        while (curResp != null) {
            curResp.reset();

            if (params.contains(RequestParam.RETAIN_PAYLOAD)) {
                curResp.retainPayload();
            }

            final long k = makeKey(curReq);

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