How to use the httptools.HttpParserCallbackError function in httptools

def test_parser_response_3(self):
        callbacks = {'on_header', 'on_headers_complete', 'on_body',
                     'on_message_complete'}

        for cbname in callbacks:
            with self.subTest('{} callback fails correctly'.format(cbname)):
                with self.assertRaisesRegex(httptools.HttpParserCallbackError,
                                            'callback failed'):

                    m = mock.Mock()
                    getattr(m, cbname).side_effect = Exception()

                    p = httptools.HttpResponseParser(m)
                    p.feed_data(RESPONSE1_HEAD + RESPONSE1_BODY)

def test_parser_request_error_in_on_message_begin(self):
        class Error(Exception):
            pass
        m = mock.Mock()
        m.on_message_begin.side_effect = Error()
        p = httptools.HttpRequestParser(m)

        try:
            p.feed_data(UPGRADE_REQUEST1)
        except httptools.HttpParserCallbackError as ex:
            self.assertIsInstance(ex.__context__, Error)
        else:
            self.fail('HttpParserCallbackError was not raised')

def data_received(self, data):
        try:
            self.parser.feed_data(data)
        except HttpParserCallbackError:
            self.close()
            raise
        except HttpParserError as pex:
            raise InvalidResponseFromServer(pex)