eZ\Publish\Core\MVC\Symfony\Controller\Content\ViewController::viewContent PHP Method

    public function viewContent($contentId, $viewType, $layout = false, array $params = array())
    {
        trigger_error("ViewController::viewContent() is deprecated since kernel 6.0.0, and will be removed in the future.\n" . 'Use ViewController::viewAction() instead.', E_USER_DEPRECATED);
        if ($viewType === 'embed') {
            return $this->embedContent($contentId, $viewType, $layout, $params);
        }
        $this->performAccessChecks();
        $response = $this->buildResponse();
        try {
            $content = $this->getRepository()->getContentService()->loadContent($contentId);
            if ($response->isNotModified($this->getRequest())) {
                return $response;
            }
            if (!isset($params['location']) && !isset($params['locationId'])) {
                $params['location'] = $this->getRepository()->getLocationService()->loadLocation($content->contentInfo->mainLocationId);
            }
            $response->headers->set('X-Location-Id', $content->contentInfo->mainLocationId);
            $response->setContent($this->renderContent($content, $viewType, $layout, $params));
            return $response;
        } catch (UnauthorizedException $e) {
            throw new AccessDeniedException();
        } catch (NotFoundException $e) {
            throw new NotFoundHttpException($e->getMessage(), $e);
        } catch (Exception $e) {
            return $this->handleViewException($response, $params, $e, $viewType, $contentId);
        }
    }