ตัวอย่าง กำหนด response เป็น json สำหรับ controller ที่ระบุ

yii2-behaviors.php

public function behaviors() {
        $behaviors = parent::behaviors();
        $behaviors['authenticator'] = [
            'class' => \yii\filters\auth\HttpBasicAuth::className(),
            'only' => ['hi','token-log-in', 'log-out',
                'list-template-data',
                'download-template-data'],
        ];
        $behaviors['response'] = [
            'class' => 'yii\filters\ContentNegotiator',

            'formats' => [
                'application/json' => Response::FORMAT_JSON,
            ],
            
        ];
        //$behaviors['contentNegotiator']['formats']['text/html'] = Response::FORMAT_JSON;
        return $behaviors;
    }