def _get_raw_xsrf_token(self):
        if not hasattr(self, '_raw_xsrf_token'):
            cookie = self.get_cookie("_xsrf")
            if cookie:
                version, token, timestamp = self._decode_xsrf_token(cookie)
            else:
                version, token, timestamp = None, None, None
            if token is None:
                version = None
                token = os.urandom(16)
                timestamp = time.time()
            self._raw_xsrf_token = (version, token, timestamp)
        return self._raw_xsrf_token
Callback to any close handler that was provided in the ctor. Handler is
dataset/ETHPy150Open RobotWebTools/rosbridge_suite/rosbridge_server/src/tornado/web.py/RequestHandler._get_raw_xsrf_token--crossover with--dataset/ETHPy150Open agoragames/haigha/haigha/connection.py/Connection._callback_close