Contao\PageError403::getResponse PHP Method

    public function getResponse($objRootPage = null)
    {
        /** @var PageModel $objPage */
        global $objPage;
        $obj403 = $this->prepare($objRootPage);
        $objPage = $obj403->loadDetails();
        /** @var PageRegular $objHandler */
        $objHandler = new $GLOBALS['TL_PTY']['regular']();
        return $objHandler->getResponse($objPage)->setStatusCode(403);
    }