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What are Server-Sent Events (SSE)?

Ashish Pratap Singh's avatar
Ashish Pratap Singh
Sep 07, 2025
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Imagine you’re watching a stock market dashboard. Prices keep changing every second, sometimes multiple times in a second.

Would you prefer hitting refresh constantly, or having updates flow to you automatically?

That’s exactly where Server-Sent Events (SSE) shine. SSE provides a simple, reliable way for a server to continuously push updates to a client over a single HTTP connection.

In this article, we’ll break down what SSE is, how it works, how it compares to alternatives like WebSockets, and where you’d actually use it in real-world systems.


What are Server-Sent Events (SSE)?

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