code: public WebSocketContext reTag(String label) {
          WebSocketConnectionRegistry registry = manager.tagRegistry();
          registry.signOff(connection);
          registry.signIn(label, connection);
          return this;
      }
docs: Re-Tag the websocket connection hold by this context with label specified.
  This method will remove all previous tags on the websocket connection and then
  tag it with the new label.
  @param label the label.
  @return this websocket conext.