$响应->标题->设置在Laravel中不起作用？

Question

我的项目使用Laravel + JWT + dingo进行开发，JWT希望实现一个中间件刷新令牌，在测试过程中可以在线找到这样的中间件

public function handle($request, Closure $next){ 
    $this->checkForToken($request);

    try {
        if ($this->auth->parseToken()->authenticate()) {
            return $next($request);
        }
        throw new UnauthorizedHttpException('jwt-auth', 'sorry');
    } catch (TokenExpiredException $exception) {
        try {
            $token = $this->auth->refresh();
            Auth::guard('api')->onceUsingId($this->auth->manager()->getPayloadFactory()->buildClaimsCollection()->toPlainArray()['sub']);
        } catch (JWTException $exception) {
            throw new UnauthorizedHttpException('jwt-auth', $exception->getMessage());
        }
    }
    return $this->setAuthenticationHeader($next($request), $token);
}

我在邮递员上测试了我的API，但无法获得标头授权 ，仅

Server →nginx/1.10.3 (Ubuntu)
Content-Type →application/json
Transfer-Encoding →chunked
Connection →keep-alive
WWW-Authenticate →jwt-auth
Cache-Control →no-cache, private
Date →Fri, 02 Nov 2018 09:55:42 GMT

函数setAuthenticationHeader是：

$response->headers->set('Authorization', 'Bearer '.$token);

为什么不起作用？ 最后我用：

        return $next($request)->withHeaders([
            'Authorization'=> 'Bearer '.$token,
        ]);

我得到了想要的东西。