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FastAPI · Class

EventSourceResponse

EventSourceResponse streams values yielded by a FastAPI path operation as Server-Sent Events. Use ServerSentEvent to control event fields such as id, event, retry, comment, or raw text.

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Syntax

@app.get("/stream", response_class=EventSourceResponse)
async def stream() -> AsyncIterable[ServerSentEvent]:
    yield ServerSentEvent(data=value)

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  • ServerSentEvent
  • fastapi.sse
  • Last-Event-ID
  • EventSourceResponse
  • Stream Data

Source: Server-Sent Events (SSE) - FastAPI. Checked 2026-11-03.