Barryvdh\Cors\Stack\CorsService::buildPreflightCheckResponse PHP Method

    private function buildPreflightCheckResponse(Request $request)
    {
        $response = new Response();
        if ($this->options['supportsCredentials']) {
            $response->headers->set('Access-Control-Allow-Credentials', 'true');
        }
        $response->headers->set('Access-Control-Allow-Origin', $request->headers->get('Origin'));
        if ($this->options['maxAge']) {
            $response->headers->set('Access-Control-Max-Age', $this->options['maxAge']);
        }
        $allowMethods = $this->options['allowedMethods'] === true ? strtoupper($request->headers->get('Access-Control-Request-Method')) : implode(', ', $this->options['allowedMethods']);
        $response->headers->set('Access-Control-Allow-Methods', $allowMethods);
        $allowHeaders = $this->options['allowedHeaders'] === true ? strtoupper($request->headers->get('Access-Control-Request-Headers')) : implode(', ', $this->options['allowedHeaders']);
        $response->headers->set('Access-Control-Allow-Headers', $allowHeaders);
        return $response;
    }