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REST is request-response. You ask, server answers, connection closes. Works fine for most things. But chat messages can't wait for you to ask. Stock prices need to push the moment they change. Notifications should appear, not be polled for. Two optio...

Di era aplikasi modern, pengguna menuntut data selalu up-to-date tanpa perlu refresh:status pesanan berubah otomatis, dashboard server update realtime, pesan dan notifikasi masuk seketika. Saat berbicara tentang realtime, yang terlintas biasanya WebS...
