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Streaming & cancellation

Read incremental events and distinguish completion from a broken stream.

SSE framing

Set stream=true. Read UTF-8 incrementally, buffer complete blank-line-separated events and parse the data field. Network chunks do not align with JSON objects, Unicode characters or event boundaries.

data: {"choices":[{"delta":{"content":"Hello"}}]}

data: {"choices":[{"delta":{"content":"!"}}]}

data: [DONE]

Completion

A chat stream completes only after [DONE]. An EOF, timeout or error event before that marker is incomplete. Never display an interrupted reply as a successful generation. Cancel readers and network requests when navigating away or pressing Stop.