options 请求跨域问题处理

    public function handle($request, Closure $next)
    {
        $response = $next($request);
        $IlluminateResponse = 'Illuminate\Http\Response';
        $SymfonyResopnse = 'Symfony\Component\HttpFoundation\Response';
        $headers = [
            'Access-Control-Allow-Origin' => '*',
            'Access-Control-Allow-Methods' => 'POST, GET, OPTIONS, PUT, PATCH, DELETE',
            'Access-Control-Allow-Headers' => 'token, X-Requested-With, Access-Control-Request-Method, Access-Control-Request-Headers, X-Token, Access-Token, Authorization, Origin, Content-Type, Cookie, Accept',
            'Access-Control-Allow-Credentials' => 'true',
            'Access-Control-Expose-Headers', 'X-My-Custom-Header, X-Another-Custom-Header, Authorization, authenticated',
        ];

        // $response是`Illuminate\Http\Response`类的一个实例，
        // 而Passport实际上使用的是`Symfony\Component\HttpFoundation\Response`类响应消息
        if ($response instanceof $IlluminateResponse) {
            foreach ($headers as $key => $value) {
                $response->header($key, $value);
            }
            return $response;
        }

        if ($response instanceof $SymfonyResopnse) {
            foreach ($headers as $key => $value) {
                $response->headers->set($key, $value);
            }
            return $response;
        }
        return $response;
    }Copy