code: def is_ignorable_request(self, request, uri, domain, referer):
          
          # '?' 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)
docs: Returns True if the given request *shouldn't* notify the site managers.