docs: private static URL getDefaultAnnounceUrl(InetSocketAddress address) {
      try {
        return new URL("http",
                address.getAddress().getCanonicalHostName(),
                address.getPort(),
                ANNOUNCE_URL);
      } catch (MalformedURLException mue) {
        logger.error("Could not build tracker URL: {}!", mue, mue);
      }
  
      return null;
    }