php - Using yii2 to build restful api, yii\web\Response::$acceptParams is empty, can anyone help me?

Question

If a request is sent via Accept: application/json; version=v1,
After content negotiation, yii\web\Response::$acceptParams will contain the value ['version' = > 'v1'].
But it is empty after printing. What is the reason?

var_dump((new Response())->acceptParams);

Answer 1

 var_dump(Yii::$app->response->acceptParams["sub-version"]);
就可以了，被手册误导了