docs: public static <T> void sendClose(final CloseMessage closeMessage, final WebSocketChannel wsChannel, final WebSocketCallback<T> callback, T context) {
          wsChannel.setCloseCode(closeMessage.getCode());
          wsChannel.setCloseReason(closeMessage.getReason());
          sendInternal(closeMessage.toByteBuffer(), WebSocketFrameType.CLOSE, wsChannel, callback, context, -1);
      }