Serving
Server-sent events
Also called SSE.
What is server-sent events?
Server-sent events is a one-way streaming protocol over plain HTTP, where a server pushes a sequence of events to a client on a long-lived connection. It is the standard transport for both streamed model output and long-running job progress.
It is preferred over websockets for this job because it is simpler, works through ordinary HTTP infrastructure, and only needs to go one way — the client is not sending anything mid-stream.
It supports resumption. A client that records the last event it saw can reconnect and ask to continue from there, which turns a dropped connection into a hiccup rather than a lost job.
Related terms
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