Contao\PageError404::generate PHP Method

    public function generate()
    {
        /** @var PageModel $objPage */
        global $objPage;
        $obj404 = $this->prepare();
        $objPage = $obj404->loadDetails();
        /** @var PageRegular $objHandler */
        $objHandler = new $GLOBALS['TL_PTY']['regular']();
        header('HTTP/1.1 404 Not Found');
        $objHandler->generate($objPage);
    }