@Bean
public HttpClient httpClient(SSLContext sslContext) {
    return HttpClients.custom()
            .setMaxConnPerRoute(30)
            .setMaxConnTotal(60)
            .setSSLContext(sslContext).build();
}
@Bean
public ClientHttpRequestFactory clientHttpRequestFactory(HttpClient httpClient) {
    return new HttpComponentsClientHttpRequestFactory(httpClient);
}
@Bean
public RestTemplate restOperations(ClientHttpRequestFactory clientHttpRequestFactory) throws Exception {
    return new RestTemplate(clientHttpRequestFactory);