Symfony\Component\HttpFoundation\Request::setTrustedProxies PHP Method

    public static function setTrustedProxies(array $proxies)
    {
        self::$trustedProxies = $proxies;
    }

 public function boot()
 {
     if ($trustedProxies = $this->container->getParameter('kernel.trusted_proxies')) {
         Request::setTrustedProxies($trustedProxies);
     } elseif ($this->container->getParameter('kernel.trust_proxy_headers')) {
         Request::trustProxyData(); // @deprecated, to be removed in 2.3
     }
 }