Get desktop application:
View/edit binary Protocol Buffers messages
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False when the server does not send web pushes.
The VAPID public key in base64url, for PushManager.subscribe. Empty when push is off.
Subscribe keeps this device's subscription for the signed-in user.
The PushSubscription's endpoint and keys, as its toJSON() gives them.
Unsubscribe forgets this device's subscription, if the signed-in user owns it.
Used as response type in: PushService.Subscribe, PushService.Unsubscribe
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