public static function set_page($page)
 {
     $Perch = Perch::fetch();
     if (PERCH_RUNWAY && $page instanceof PerchRoutedPage) {
         $Perch->set_page($page->path);
         self::$RoutedPage = $page;
     } else {
         $Perch->set_page($page);
     }
     $Content = PerchContent::fetch();
     $Content->clear_cache();
 }