namespace Drupal\magazine_home_redirect\EventSubscriber;

use Symfony\Component\HttpKernel\KernelEvents;
use Symfony\Component\HttpKernel\Event\RequestEvent;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Drupal\Core\Path\PathMatcherInterface;
use Drupal\Core\Routing\RouteMatchInterface;
use Symfony\Component\HttpKernel\HttpKernelInterface;

class MagazineHomepageRedirectSubscriber implements EventSubscriberInterface {

  protected $httpKernel;

  public function __construct(HttpKernelInterface $http_kernel) {
    $this->httpKernel = $http_kernel;
  }

  public static function getSubscribedEvents() {
    return [
      KernelEvents::REQUEST => ['onRequest', 50],
    ];
  }

  public function onRequest(RequestEvent $event) {
    $request = $event->getRequest();
    $host = $request->getHost();
    $path = $request->getPathInfo();

    if (preg_match('#^magazine\.nws\.engineering$#', $host) && preg_match('#^/(en|de|it)/?$#', $path, $matches)) {
      $lang = $matches[1];
      $sub_request = Request::create("/$lang/nws-magazine", 'GET', [], $request->cookies->all(), [], $request->server->all());

      $response = $this->httpKernel->handle($sub_request, HttpKernelInterface::SUB_REQUEST);
      $event->setResponse($response);
    }
  }
}
The website encountered an unexpected error. Try again later.<br><br><em class="placeholder">Error</em>: Class &quot;Drupal\magazine_home_redirect\EventSubscriber\MagazineHomepageRedirectSubscriber&quot; not found in <em class="placeholder">Drupal\Component\DependencyInjection\Container-&gt;createService()</em> (line <em class="placeholder">259</em> of <em class="placeholder">core/lib/Drupal/Component/DependencyInjection/Container.php</em>).