Grokking Node.js
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Introduction to WebSockets and Real-Time Communication

An HTTP server can only answer. A browser asks for a page, the server sends it, and the exchange is over; the server has no way to send the browser anything until the browser asks again. A chat app built this way cannot show ben's new message on ana's screen when ben sends it. Ana's browser has to ask, again and again, "anything new?"

A WebSocket removes that limit. It is a single connection that stays open after it is set up, and both sides can send a message over it at any moment

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