How do text messengers like WhatsApp or Instagram detect whether someone is typing or not?

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How do text messengers like WhatsApp or Instagram detect whether someone is typing or not?

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Anonymous 0 Comments

The app doesn’t just wait for you to press the “send” button, it listens to every key you press. Every once in a while the app just sends the server a short message indicating your current status and whether you are currently typing or not.