docs: private static Pubsub.Builder newPubsubClient(PubsubOptions options) {
      return new Pubsub.Builder(Transport.getTransport(), Transport.getJsonFactory(),
          chainHttpRequestInitializer(
              options.getGcpCredential(),
              // Do not log 404. It clutters the output and is possibly even required by the caller.
              new RetryHttpRequestInitializer(ImmutableList.of(404))))
          .setRootUrl(options.getPubsubRootUrl())
          .setApplicationName(options.getAppName())
          .setGoogleClientRequestInitializer(options.getGoogleApiTrace());
    }