1.七牛抓取第三方資源 總是回傳404 找不到第三方資源

2.這是我寫的抓取部分程式碼,用的是thinkphp3.2自帶的七牛類

 //第三方资源抓取
    public function fetch($url, $key)
    {
        $url         = self::Qiniu_Encode($url);
        $request_url = "http://iovip.qbox.me/fetch/{$url}/to/" . self::Qiniu_Encode("{$this->bucket}:{$key}");
        $accessToken = $this->accessToken($request_url);
        $response    = $this->request($request_url, 'POST', array('Content-Type:' => 'application/x-www-form-urlencoded', 'Authorization' => "QBox $accessToken"));
        return $response;
    }

3.抓取的資源:https://www.baidu.com/img/bd_...

4.傳回的錯誤提示: [HTTP/1.1 404 Not Found]:Not Found]"