Reference · Glossary

SSE (Server-Sent Events)

Last updated Jul 17, 2026

An HTTP pattern where the **server pushes chunks** to the browser over one long response — common for LLM streaming.

#When to use

Chat UIs that show tokens as they arrive from your API route.

Bidirectional real-time apps that need client→server pushes constantly — WebSockets may fit better.

OpenAI streaming returns SSE lines like `data: {"choices":[{"delta":{"content":"Hi"}}]}`.