What is wrong with Setting read-only property: yii\web\Application::response?

Question

Yii

There is a simple code in the controller, the task of which is to give data in the form of JSON

public function actionGroupList($id){
    Yii::$app->response = Response::FORMAT_JSON;
    $groupList = CatalogHelper::getGroupList($id);

    return $groupList;
  }

Which throws this error:

Invalid Call – yii\base\InvalidCallException

Setting read-only property: yii\web\Application::response

Although in the documentation, it is written that way

public function actionInfo()
{
    \Yii::$app->response->format = \yii\web\Response::FORMAT_JSON;
    return [
        'message' => 'hello world',
        'code' => 100,
    ];
}

www.yiiframework.com/doc-2.0/guide-runtime-respons...

Answer 1

Yii::$app->response =
and
kagbe are not the same thing.
and the error speaks for itself.