* @return
     * @throws IOException
     */
    protected <T extends Response> long doSend ( Request request, T response, Set<RequestParam> params, long timeout ) throws IOException {
        long firstKey = prepareRequests(request, response, params, timeout);
        doSend(request);
        return firstKey;
    }


    /**
     * @param request
     * @param response
     * @param params
     * @param timeout