I have some URLs from the old version of my site that I want to redirect to their new ones in Yii2 due to SEO purposes, eg. `/about-us.php` to `/about`. How do I do that?

I can't use `.htaccess`, and I can't use `urlManager` rules because HTTP response status 301 needs to be set.

I tried the following in a bootstrap class but even though the code executes I still just get a 404 when going to the old URL:

```php
if (preg_match("|^/about.php|", $_SERVER['REQUEST_URI'])) {
    Yii::$app->response->redirect('/about', 301)->send();
    return;
}

```