def update_url(self, url=None):
        """
        Accepts a fully-qualified url.
        Returns True if successful, False if not successful.
        """
        if not url:
            raise ValueError("Neither a url or regex was provided to update_url.")
        post_url = (self.BASE_URL, url) % "%s%s"
        r = self.session.post(post_url)
        return int(r.status_code) < 500
dataset/ETHPy150Open skoczen/django-seo-js/django_seo_js/backends/prerender.py/PrerenderHosted.update_url/swapped operands of `%`