retryhandler.py 文件源码

def _check_response(self, attempt_number, response):
        http_response = response[0]
        expected_crc = http_response.headers.get(self._header_name)
        if expected_crc is None:
            logger.debug("crc32 check skipped, the %s header is not "
                         "in the http response.", self._header_name)
        else:
            actual_crc32 = crc32(response[0].content) & 0xffffffff
            if not actual_crc32 == int(expected_crc):
                logger.debug(
                    "retry needed: crc32 check failed, expected != actual: "
                    "%s != %s", int(expected_crc), actual_crc32)
                raise ChecksumError(checksum_type='crc32',
                                    expected_checksum=int(expected_crc),
                                    actual_checksum=actual_crc32)