public ClientHttpRequestFactory clientHttpRequestFactory() throws IOReactorException {
        final DefaultConnectingIOReactor ioreactor = new DefaultConnectingIOReactor(IOReactorConfig.custom().
                setConnectTimeout(3000).
                setIoThreadCount(4).
                setSoTimeout(3000).
                build());

        final PoolingNHttpClientConnectionManager connectionManager = new PoolingNHttpClientConnectionManager(ioreactor);
        connectionManager.setDefaultMaxPerRoute(100);
        connectionManager.setMaxTotal(1000);

        CloseableHttpAsyncClient httpAsyncClient = HttpAsyncClients.custom()
                .setConnectionManager(connectionManager)
                .build();

        return new HttpComponentsAsyncClientHttpRequestFactory(httpAsyncClient);

    }

    @Override
    public void customize(RestTemplate restTemplate) {
        try {
            restTemplate.setRequestFactory(clientHttpRequestFactory());
        } catch (IOReactorException e) {
            e.printStackTrace();
        }
    }