req.Header.Add("Authorization", "OAuth2 "+this.Arvados.ApiToken)
req.Header.Add("Content-Type", "application/octet-stream")
req.Header.Add(X_Keep_Desired_Replicas, fmt.Sprint(this.Want_replicas))
req.Header.Add("Authorization", "OAuth2 "+this.Arvados.ApiToken)
req.Header.Add("Content-Type", "application/octet-stream")
req.Header.Add(X_Keep_Desired_Replicas, fmt.Sprint(this.Want_replicas))