def get_body(self):
        """Get the body value from the response.

        :return: a future contains the deserialized value of body
        """

        raw_body = yield get_arg(self, 2)
        if not self.serializer:
            raise tornado.gen.Return(raw_body)
        else:
            body = self.serializer.deserialize_body(raw_body)
            raise tornado.gen.Return(body)
Get the body value from the response.

        :return: a future contains the deserialized value of body