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並前往https://www.quora.com/What-technology-does-the-iOS-Apple-Push-Notification-Service-APNS-use-to-maintain-a-persistent-connection-with-each-device-to-receive-such-fast-push-notifications

What technology does the iOS Apple Push Notification Service ...

Each IOS device that has Push notifications enabled connects via a TCP socket to the APNS server on port 5223. This is done via the "apsd" process.

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