Fix SSL in Laravel 5 when server is behind a load balancer or a reverse proxy
Install via composer composer require njxqlus/laravel-valid-proxies
For Laravel 5.4 you need to add Service Provider in your config/app.php file:
njxqlus\LaravelValidProxies\ServiceProvider::class
ValidProxies Middleware already pushed to web middleware group.
If you want to use middleware global - add to to app\Http\Kernel in $middleware array:
\njxqlus\LaravelValidProxies\Middleware\ValidProxies::class