docs: public static Map<String, Object> createProxyClientConfig(String proxyUri, String username, String password) {
  
          Map<String, Object> clientConfig = new HashMap<>();
          clientConfig.put(ClientProperties.PROXY_URI, proxyUri);
  
          if (username != null && username.trim().length() > 0) {
              clientConfig.put(ClientProperties.PROXY_USERNAME, username);
          }
  
          if (password != null && password.trim().length() > 0) {
              clientConfig.put(ClientProperties.PROXY_PASSWORD, password);
          }
  
          return (clientConfig);
      }