Redirection des urls avec un slash à la fin

common/config/main.php

 return [
     'vendorPath' => dirname(dirname(__DIR__)) . '/vendor',
     'on beforeRequest' => function () {
-        $app = Yii::$app;
-        $pathInfo = $app->request->pathInfo;
-        if (!empty($pathInfo) && substr($pathInfo, -1) == '/') {
-            $url = Yii::$app->request->getAbsoluteUrl();
+        $url = Yii::$app->request->getAbsoluteUrl();
+        if (!empty($url) && substr($url, -1) == '/') {
             $url = substr($url, 0, strlen($url) - 1);
             Yii::$app->getResponse()->redirect($url, 301);
             Yii::$app->end();