System Design Fundamentals

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Introduction to Real-Time Communication

Some applications need to show new information the moment it happens. A chat message, a live cricket score, a rising stock price. Waiting even a few seconds feels broken. Delivering updates to the user as soon as they happen is called real-time communication.

This chapter explains the three most popular techniques for it: Long-Polling, WebSockets, and Server-Sent Events. Before we compare them, we need to understand the problem they all solve. The problem starts with how HTTP works.

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