beego 作为中间层下载文件

// @router /other/download-video [*]
func (this *OtherController) DownLoadVideo() {
	link := this.GetString("link", "")
	if link == "" {
		this.toJson(-403, "args err", map[string]string{})
	}
	split := strings.Split(link, "/")
	sname := split[len(split)-1:][0]
	//this.Ctx.Output.Header("Content-type", "application/octet-stream")
	this.Ctx.Output.Header("Content-type", "application/force-download")
	this.Ctx.Output.Header("Content-Disposition", "attachment;filename="+sname)
	this.Ctx.Output.Header("Pragma", "No-cache")
	this.Ctx.Output.Header("Cache-Control", "No-cache")
	this.Ctx.Output.Header("Expires", "0")

	tr := &http.Transport{
		TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
	}
	client := &http.Client{Transport: tr}

	resp, err := client.Get(link)
	fmt.Println("download-video ==>  [xxx]  resp  ", resp)
	fmt.Println("download-video ==> [xxx]  err  err  ", err)
	if resp != nil {
		defer func() {
			resp.Body.Close()
		}()
	}

	//body, err := ioutil.ReadAll(resp.Body)

	_, err = io.Copy(this.Ctx.ResponseWriter, resp.Body)
	//fmt.Println(written)
	fmt.Println("download...   ", err)
	//this.Ctx.WriteString(string(body))
}