docs: @Override
      public Object onClose(WsRequest wsRequest, byte[] bytes, ChannelContext channelContext) throws Exception {
          TioWebsocketMethodMapper onClose = methods.getOnClose();
          if (onClose != null) {
              onClose.getMethod().invoke(onClose.getInstance(), channelContext);
          }
          log.debug("onClose");
          Tio.remove(channelContext, "onClose");
          return null;
      }