Handling APNs Feedback
APNs can provide feedback to each server that connects to it and sends notifications. If any of the device tokens specified in the messages have errors (for example, if the user has deleted the app from her device), then the server should prevent sending future notifications to the disabled devices. Many APNs libraries (including apn_on_rails) have facilities built in to communicate with the feedback endpoint, which can be scheduled to run periodically. After the feedback has been obtained, stored device tokens on the server should be updated or removed to prevent sending additional notifications to them.
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