Response响应的withHeaders方法定义的位置在哪儿?

vendor/laravel/framework/src/Illuminate/Http/ResponseTrait.php

github.com/laravel/framework/blob/...

    /**
     * Add an array of headers to the response.
     *
     * @param  \Symfony\Component\HttpFoundation\HeaderBag|array  $headers
     * @return $this
     */
    public function withHeaders($headers)
    {
        if ($headers instanceof HeaderBag) {
            $headers = $headers->all();
        }


        foreach ($headers as $key => $value) {
            $this->headers->set($key, $value);
        }


        return $this;
    }

:joy:我在5.1的代码里扒拉找半天....

用的什么编辑器？Ctrl 不就进去了