in topic.go [118:128]
func (p *MNSTopic) Unsubscribe(subscriptionName string) (err error) {
subscriptionName = strings.TrimSpace(subscriptionName)
if err = checkTopicName(subscriptionName); err != nil {
return
}
_, err = send(p.client, p.decoder, DELETE, nil, nil, fmt.Sprintf("topics/%s/subscriptions/%s", p.name, subscriptionName), nil)
return
}