go 代理问题

const proxyServer = "http-dyn.abuyun.com:9020"

// 代理隧道验证信息
const proxyUser  = "H8K54D3646J2X67D";
const proxyPass  = "C6228A18B130EF63";

type AbuyunProxy struct {
	AppID string
	AppSecret string
}

func (p AbuyunProxy) ProxyClient() http.Client {
	proxyUrl, _ := url.Parse("http://"+ p.AppID +":"+ p.AppSecret +"@"+ proxyServer)
	return http.Client{Transport: &http.Transport{Proxy: http.ProxyURL(proxyUrl)}}
}
func main()  {
	targetUrl := "https://anime-pictures.net/pictures/download_image/640247-5528x3508-kimetsu+no+yaiba-uzui+tengen-mikki-single-short+hair-highres.png"
	// 初始化 proxy http client
	client := AbuyunProxy{AppID: proxyUser, AppSecret: proxyPass}.ProxyClient()

	request, _ := http.NewRequest("GET", targetUrl, bytes.NewBuffer([]byte(``)))

	response, err := client.Do(request)

	if err != nil {
		panic("failed to connect: " + err.Error())
	}
	/*response, err := http.Get(targetUrl)
	if err != nil{
		fmt.Println("请求图片 url 失败",err)
	}*/
	fmt.Println(response)
	defer response.Body.Close()
	name := "./H_1.jpg"
	out, err := os.Create(name)
	if err != nil{
		fmt.Println("创建文件失败",err)
	}
	defer out.Close()
	pix, err := ioutil.ReadAll(response.Body)
	if err != nil{
		fmt.Println(err)
	}
	_, err = io.Copy(out, bytes.NewReader(pix))
	if err != nil {
		fmt.Println("下载文件失败",err)
	}
}

各位大佬帮忙看一下，我用代理返回的 status 是 200，但是 ioutil.ReadAll 读取会出现 unexpected EOF 错误，后面我又用了上面注释的 http.Get 请求，ioutil.ReadAll 读取是可以保存图片的，但是 http.Get 请求和代理请求都是 status，为什么代理不能被 ioutil.ReadAll 读取呢，上面代理用的是阿布云的代理，测试账号已经是过期的