TrustProxyFilter.php

<?php
namespace App\Routing\Filter;

use Cake\Event\Event;
use Cake\Routing\Dispatcherfilter;

class TrustProxyFilter extends DispatcherFilter
{
    /**
     * {inheritDoc}
     */
    public function beforeDispatch(Event $event)
    {
        $event->data['request']->trustProxy = true;
    }
}