def unsubscribe():
topic = request.headers.get('topic')
subscriberIdentifier = request.headers.get('identifier')
bootid = int(request.headers.get('bootid'))
callbackAddress = request.remote_addr
callbackPort = int(request.headers.get('callbackPort'))
sm = SubscriptionManager()
sm.removeSubscription(topic, subscriberIdentifier, bootid)
logging.info('Unsubscribed successfully')
logging.debug(sm.subs)
return ('', 204)
