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Server-Sent Events (SSE)

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One-way push without WebSockets

Many real-time features only need the server to push data to the browser — stock tickers, live notifications, progress tracking, AI response streaming. Server-Sent Events (SSE) handle this with a simple long-lived HTTP connection and a plain text protocol.

Unlike WebSockets, SSE is standard HTTP — it works transparently through proxies, load balancers, and CDNs. The browser's EventSource API handles everything automatically.

Packets in motion — click to inspect:

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