docs: public static String getDefaultSSLServerSocketFactory() {
          if (defaultSSLServerSocketFactory == null) {
              defaultSSLServerSocketFactory = AccessController.doPrivileged(new PrivilegedAction<String>() {
                  @Override
                  public String run() {
                      return Security.getProperty("ssl.ServerSocketFactory.provider");
                  }
              });
          }
  
          return defaultSSLServerSocketFactory;
      }