Returns True if the given request *shouldn't* notify the site managers.

def is_ignorable_request(self, request, uri, domain, referer):
        """
        Returns True if the given request *shouldn't* notify the site managers.
        """
        # '?' in referer is identified as search engine source
        if (not referer or (not self.is_internal_request(
                domain, referer) and '?' in referer)):
            return True
        return any(
            pattern.search(uri) for pattern in settings.IGNORABLE_404_URLS)