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 = "%s%s" % (self.BASE_URL, url)
        r = self.session.post(post_url)
        return int(r.status_code) < 500