docs: private HttpClientConnectionManager createHttpClientConnectionManager() {
          ConnectionSocketFactory socketFactory = PlainConnectionSocketFactory.getSocketFactory();
          LayeredConnectionSocketFactory sslSocketFactory;
          try {
              sslSocketFactory = new SSLConnectionSocketFactory(SSLContext.getDefault(),
                      SSLConnectionSocketFactory.STRICT_HOSTNAME_VERIFIER);
          } catch (NoSuchAlgorithmException e) {
              throw new BceClientException("Fail to create SSLConnectionSocketFactory", e);
          }
          Registry<ConnectionSocketFactory> registry =
                  RegistryBuilder.<ConnectionSocketFactory>create().register(Protocol.HTTP.toString(), socketFactory)
                          .register(Protocol.HTTPS.toString(), sslSocketFactory).build();
          PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager(registry);
          connectionManager.setDefaultMaxPerRoute(this.config.getMaxConnections());
          connectionManager
                  .setDefaultSocketConfig(SocketConfig.custom().setSoTimeout(this.config.getSocketTimeoutInMillis())
                          .setTcpNoDelay(true).build());
          connectionManager.setMaxTotal(this.config.getMaxConnections());
          return connectionManager;
      }