Issue #3308765 by kunal_singh:...

use Drupal\Core\Path\PathMatcherInterface;

use Drupal\Core\Url;

use Drupal\Core\Logger\LoggerChannelTrait;

use Drupal\external_hreflang\Event\ExternalHreflangGetCurrentUrlEvent;

use Symfony\Component\EventDispatcher\EventSubscriberInterface;

use Symfony\Component\HttpFoundation\RequestStack;

 */

class ExternalHreflangGetCurrentUrlEventSubscriber implements EventSubscriberInterface {

  use LoggerChannelTrait;

  /**

   * The path matcher.

   *

   *   Event object.

   */

  public function onGetCurrentUrlEvent(ExternalHreflangGetCurrentUrlEvent $event) {

    try {

      if ($this->pathMatcher->isFrontPage()) {

        $url = Url::fromRoute('<front>');

      }

      else {

        $url = Url::createFromRequest($this->requestStack->getCurrentRequest());

      }

    }

    catch (\Exception $e) {

      $this->getLogger('ExternalHreflangGetCurrentUrlEventSubscriber')->error('Error occurred while getting the url. Message: @message', [

        '@message' => $e->getMessage(),

      ]);

      // Store the empty url.

      $url = Url::fromRoute('<none>');

    }

    $event->setCurrentUrl($url);

  }