I am investigating whether firebase and angularfire are a good fit for my upcoming project.
One of the requirements are for users to be notified when the app is clos
Yes. This was not the case until recently, though.
Thanks to @libik for providing relevant documentation link:
https://firebase.google.com/docs/cloud-messaging/server#http-request
Update 5/2016 :
on Google io 16 , Google announced FCM - Firebase cloud messaging service.
With the announced expansion of Firebase at Google I/O recently, we also introduced Firebase Cloud Messaging (FCM) and Firebase Notifications (FN). As a developer, there are lots of updates that you might be able to take advantage of.
see more at : https://developers.googleblog.com/2016/05/google-cloud-messaging-and-firebase.html
documentation : https://firebase.google.com/docs/cloud-messaging/#key_functions