Removed UpdateCacheMiddleware._session_accessed()

        self.cache_alias = settings.CACHE_MIDDLEWARE_ALIAS

        self.cache = caches[self.cache_alias]

    def _session_accessed(self, request):

        try:

            return request.session.accessed

        except AttributeError:

            return False

    def _should_update_cache(self, request, response):

        return hasattr(request, '_cache_update_cache') and request._cache_update_cache