To be sure to make connection persistent APNs may consider connections that are rapidly and repeatedly established and torn down as a denial-of-service attack. Upon error, APNs closes the connection on which the error occurred. https://developer.apple.com/library/ios/#documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/CommunicatingWIthAPS/ CommunicatingWIthAPS.html#//apple_ref/doc/uid/TP40008194-CH101-SW1
• Notification cooperating with Web service • Scalable and stable system architecture • Combination of existing modules • Hold connections and make them persistent Recap