问腾讯点播视频删除鉴权错误，报4100？

	nowTime := time.Now().Unix()
	r := rand.New(rand.NewSource(time.Now().UnixNano()))
	random := r.Int()

	action := "DeleteVodFile"
	nonce := strconv.Itoa(random)
	region := "ap-guangzhou"
	secretId := "AKIDJct33uY5RcgdT8g3IPQK3iN0Y1Oh3vqq"
	signatureMethod := "HmacSHA1"
	timestamp := strconv.Itoa(int(nowTime))
	fileId := "5285890781379611159"
	priority := "0"

	// 加密前 手动按字典排序
	dataFoo := "GETvod.api.qcloud.com/v2/index.php?"
	dataFoo += "Action=" + action
	dataFoo += "&Nonce=" + nonce
	dataFoo += "&Region=" + priority
	dataFoo += "&SecretId=" + secretId
	dataFoo += "&SignatureMethod=" + signatureMethod
	dataFoo += "&Timestamp=" + timestamp
	dataFoo += "&fileId=" + fileId
	dataFoo += "&priority=" + priority

	signature := this.signature(dataFoo)
	signatureUrl := url.QueryEscape(signature)

	fmt.Println("Signature:", signature)
	fmt.Println("SignatureUrl:", signatureUrl)

	// 实际申请的数据顺序无关
	dataBar := "https://vod.api.qcloud.com/v2/index.php?"
	dataBar += "Action=" + url.QueryEscape(action)
	dataBar += "&fileId=" + url.QueryEscape(fileId)
	dataBar += "&Nonce=" + url.QueryEscape(nonce)
	dataBar += "&priority=" + url.QueryEscape(priority)
	dataBar += "&Region=" + url.QueryEscape(region)
	dataBar += "&SecretId=" + url.QueryEscape(secretId)
	dataBar += "&SignatureMethod=" + url.QueryEscape(signatureMethod)
	dataBar += "&Timestamp=" + url.QueryEscape(timestamp)
	dataBar += "&Signature=" + signatureUrl

	req, err := http.NewRequest("GET", dataBar, nil)
	//	req, err := http.NewRequest("POST", "https://vod.api.qcloud.com/v2/index.php?Action=DeleteVodFile", buf)
	if err != nil {
		fmt.Println("NewRequest失败：", err.Error())
		return
	}

	client := &http.Client{}
	resp, err := client.Do(req)
	if err != nil {
		fmt.Println("client.Do失败：", err.Error())
		return
	}
	stdout := os.Stdout
	io.Copy(stdout, resp.Body)
	defer resp.Body.Close()