source: app/Http/Middleware/TrustProxies.php

<?php

namespace App\Http\Middleware;

use Illuminate\Http\Middleware\TrustProxies as Middleware;
use Illuminate\Http\Request;

class TrustProxies extends Middleware
{
    /**
     * The trusted proxies for this application.
     *
     * @var array|string|null
     */
    //protected $proxies;

    /**
     * The headers that should be used to detect proxies.
     *
     * @var int
     */
//    protected $headers =
//        Request::HEADER_X_FORWARDED_FOR |
//        Request::HEADER_X_FORWARDED_HOST |
//        Request::HEADER_X_FORWARDED_PORT |
//        Request::HEADER_X_FORWARDED_PROTO |
//        Request::HEADER_X_FORWARDED_AWS_ELB;

    protected $proxies = '*';
    protected $headers = Request:: HEADER_X_FORWARDED_AWS_ELB;
}