func parseRequestToken(token string) (subToken string, nodeIndex int) {
	if token == "" {
		return token, -1
	}
	i := strings.Index(token, ":")
	if i < 0 {
		return token, -1
	}
	nodeIndex, err := strconv.Atoi(token[i+1:])
	if err != nil {
		return token, -1
	}
	subToken = token[:i]
	return subToken, nodeIndex
}