def log_exception(self, exc_info):
    """Logs an exception.  This is called by :meth:`handle_exception`
    if debugging is disabled and right before the handler is called.
    The default implementation logs the exception as error on the
    :attr:`logger`.

    .. versionadded:: 0.8
    """
    self.logger.error(
        "Exception on %s [%s]" % (request.path, request.method), exc_info=exc_info
    )