Laravel 7 behind NGINX with SSL can't load assets?

Question

Laravel

I'm trying to learn what Laravel is

Given:
- laravel 7 on apache
- ngix as a proxy

in the config is written:
'url' => env('APP_URL', 'https://bookeen.ru'),

in .env
APP_URL=https://bookeen.ru

In TrustProxies
protected $proxies = '*';
Until I registered a proxy in the trust, there was Mixed content from http to assets. Now they have https but 404. Is there any correct solution?