def log_request_fail(self, method, full_url, body, duration, status_code=None, exception=None):
        """
        Log an unsuccessful API call.
        """
        logger.warning(
            '%s %s [status:%s request:%.3fs]', method, full_url,
            status_code or 'N/A', duration, exc_info=exception is not None
        )

        if body and not isinstance(body, dict):
            body = body.decode('utf-8')

        logger.debug('> %s', body)
Log an unsuccessful API call.