String requestJson = "jsondata";

    String url = "http://gooddata.com:4055/test?action=search";
    for (int i = 1; i <= 100; i++) {
        long start = System.currentTimeMillis();
        CompletableFuture<HttpResponse> resp =
                HttpAsyncClientUtils.getInstance().sendPost(2000, url, proxy, requestJson);
        HttpResponse response = null;
        try {
            response = resp.get();
            if (response != null) {

            }
        }catch (Exception ex) {
            System.out.println("timeout exception.." + ex.getMessage());
        }finally {
            if (response != null) {
                EntityUtils.consumeQuietly(response.getEntity());
            }
        }
        long end = System.currentTimeMillis();
        System.out.println(end - start);
    }