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();
+            $url = substr($url, 0, strlen($url) - 1);
+            Yii::$app->getResponse()->redirect($url, 301);
+            Yii::$app->end();
+        }
+    },
     'components' => [
         'user' => [
             'class' => 'yii\web\User',