+$a->config['system']['directory'] = 'https://dir.friendica.social';
+
+// Allowed protocols in link URLs; HTTP protocols always are accepted
+$a->config['system']['allowed_link_protocols'] = array('ftp', 'ftps', 'mailto', 'cid', 'gopher');
+
+// Authentication cookie lifetime, in days
+$a->config['system']['auth_cookie_lifetime'] = 7;