RestTemplate 支持 https 请求

@Bean
public RestTemplate restTemplate() {
  RequestConfig.Builder builder = RequestConfig.custom();
  builder
    // 响应超时时间
    .setSocketTimeout(30 * 1000)
    // 建立 TCP 超时时间
    .setConnectTimeout(10 * 1000)
    // 从连接池中获取连接超时时间
    .setConnectionRequestTimeout(5 * 1000)
    .setCookieSpec(CookieSpecs.IGNORE_COOKIES);
  RequestConfig defaultRequestConfig = builder.build();

  HttpClientBuilder clientBuilder = HttpClientBuilder.create().useSystemProperties();
  clientBuilder.setDefaultRequestConfig(defaultRequestConfig);

  // 禁用重试
  clientBuilder.disableAutomaticRetries();

  try {
    // SSL or TLS
    SSLContext sc = SSLContext.getInstance("SSL");
    sc.init(null,
            new TrustManager[]{new X509TrustManager() {
              @Override
              public void checkClientTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {

              }

              @Override
              public void checkServerTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {

              }

              @Override
              public X509Certificate[] getAcceptedIssuers() {
                return new X509Certificate[0];
              }
            }},
            new java.security.SecureRandom());
    // 设置 http 和 https 协议对应的处理 socket 链接工厂的对象
    Registry<ConnectionSocketFactory> registry = RegistryBuilder.<ConnectionSocketFactory>create()
      .register("http", PlainConnectionSocketFactory.INSTANCE)
      .register("https", new SSLConnectionSocketFactory(sc, NoopHostnameVerifier.INSTANCE))
      .build();
    PoolingHttpClientConnectionManager pool = new PoolingHttpClientConnectionManager(registry);
    // 整个连接池的最大支持连接数
    pool.setMaxTotal(500);
    // 当前主机到目的主机的一个路由
    pool.setDefaultMaxPerRoute(150);
    clientBuilder.setConnectionManager(pool);
  } catch (Exception e) {
    log.error("msg: {}", e.getMessage(), e);
  }
  CloseableHttpClient httpClient = clientBuilder.build();
  HttpComponentsClientHttpRequestFactory factory = new HttpComponentsClientHttpRequestFactory(httpClient);

  RestTemplate restTemplate = new RestTemplate(factory);
  restTemplate.setRequestFactory(new BufferingClientHttpRequestFactory(new SimpleClientHttpRequestFactory()));
  restTemplate.setInterceptors(Collections.singletonList(new RestTemplateLoggingRequestInterceptor()));
  return restTemplate;
}