Server-Sent Events
SSE (Server-Sent Events) is a lightweight HTTP protocol for one-way server push, streaming events to the browser continuously over text/event-stream.
Purpose
For server-to-client-only push it offers a simpler native browser API than WebSocket, with automatic reconnection.
Mechanism
The response uses Content-Type: text/event-stream and streams event blocks made of data: lines (with id/event/data fields). The browser's EventSource API reconnects automatically and resumes via Last-Event-ID.
Use cases
- Real-time notifications and news
- Log streaming
- Stock tickers
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