def _on_close(self):
        self._stats.retransmits = self._retransmits
        self._stats_callback(self._stats)
view should flag a message and return the expected response.
dataset/ETHPy150Open facebook/fbtftp/fbtftp/base_handler.py/BaseHandler._on_close--crossover with--dataset/ETHPy150Open ofa/connect/open_connect/connectmessages/tests/test_views.py/MessageFlagViewTest.test_message_flag_view