Barryvdh\Cors\HandlePreflight::handle PHP Метод

    public function handle($request, Closure $next)
    {
        $response = $next($request);
        if ($this->cors->isPreflightRequest($request) && $this->hasMatchingCorsRoute($request)) {
            $preflight = $this->cors->handlePreflightRequest($request);
            $response->headers->add($preflight->headers->all());
        }
        return $response;
    }