[JustSomeNobody]

> This is probably what apps will do in response to the rule changes. It isn't ideal, though. Incoming notifications can trigger application code to run, but only for notifications that include a visible display to the user. This means that a server has to differentiate between different types of data on their network, like knowing the difference between a new user message and a read receipt. It is not ideal for privacy to expose that information to the server.

I guess I still don't get it.

A notification comes into the iPhone. iOS wakes the app. The user clicks the notification, the app opens, the user reads the message and the app sends a read receipt to it's own servers.

A new message would just be a new message. The user would type it and hit send. The app would send it to it's servers which would then use the push api to send a message to the recipient.

Edit: Ok, I get it. The point is one doesn't want a server knowing the difference between the two types of messages. That's a leak of metadata.