docs: @Nonnull
    public static EChange setResponseGzipEnabled (final boolean bResponseGzipEnabled)
    {
      return s_aRWLock.writeLocked ( () -> {
        if (s_bResponseGzipEnabled == bResponseGzipEnabled)
          return EChange.UNCHANGED;
        s_bResponseGzipEnabled = bResponseGzipEnabled;
        LOGGER.info ("ResponseHelper responseGzipEnabled=" + bResponseGzipEnabled);
        return EChange.CHANGED;
      });
    }