Cms example

    public function indexAction()
    {
        if ($this->Request()->getParam('isXHR')) {
            $this->View()->loadTemplate('frontend/custom/ajax.tpl');
        }

        $shopId = $this->container->get(ContextServiceInterface::class)->getShopContext()->getShop()->getId();

        $staticPage = Shopware()->Modules()->Cms()->sGetStaticPage($this->Request()->get('sCustom'), $shopId);

        if (!\is_array($staticPage)) {
            throw new ResourceNotFoundException('Custom page not found', $this->Request());
        }

        if (!empty($staticPage['link'])) {
            $link = Shopware()->Modules()->Core()->sRewriteLink($staticPage['link'], $staticPage['description']);

            $this->redirect($link, ['code' => Response::HTTP_MOVED_PERMANENTLY]);

            return;
        }