web\UrlNormalizer $action

Action to perform during route normalization. Available options are:

• null - no special action will be performed
• 301 - the request should be redirected to the normalized URL using permanent redirection
• 302 - the request should be redirected to the normalized URL using temporary redirection
• 404 - yii\web\NotFoundHttpException will be thrown

• callable - custom user callback, for example:

  function ($route, $normalizer) {
      // use custom action for redirections
      $route[1]['oldRoute'] = $route[0];
      $route[0] = 'site/redirect';
      return $route;
  }