APNs priority and headers

Pick all that apply

• 1Choice 1.

  apns-priority: 10 means immediate delivery and is for notifications the user sees, and using 10 on a push that carries only content-available can make APNs return an error or limit delivery

• 2Choice 2.

  apns-priority: 5 can have its delivery delayed to account for the device's power state, and it's the recommended value for a background refresh push

• 3Choice 3.

  The apns-push-type header has been required since iOS 13 and has to state the nature of the payload with alert, background, voip, and so on

• 4Choice 4.

  apns-expiration: 0 means store it indefinitely, so an offline device gets it when it comes back on

• 5Choice 5.

  apns-collapse-id merges notifications with the same id into the latest one, and the value has to be 64 bytes or less