Ajax 调跨域接口，谷歌浏览器出现 Provisional headers are shown [ 2.0 版本 ]

在动作中加上：

Yii::$app->response->headers->add('Access-Control-Allow-Origin', '*');

如果是 dev 环境，请修改

if (YII_ENV_DEV) {
    // configuration adjustments for 'dev' environment
    $config['bootstrap'][] = 'debug';
    $config['modules']['debug'] = [
        'class' => 'yii\debug\Module',
        // uncomment the following to add your IP if you are not connecting from localhost.
        'allowedIPs' => ['*'], // 这里改为 *，表示允许任何 IP 请求
    ];
}