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Responses API Streaming: token too long error #368

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alecrubin opened this issue Apr 9, 2025 · 1 comment · May be fixed by #373
Open

Responses API Streaming: token too long error #368

alecrubin opened this issue Apr 9, 2025 · 1 comment · May be fixed by #373

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@alecrubin
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alecrubin commented Apr 9, 2025 •
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When using the client.Responses.NewStreaming() method, I have noticed intermittent errors with the bufio.Scanner, resulting in this error: bufio.Scanner: token too long.
@mrene
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mrene commented Apr 15, 2025 •
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We've also seen this issue, it happens when an SSE event is larger than bufio.MaxScanTokenSize (64k) . Incidently the newly released gpt-4.1 seems to generate tokens fast enough to go over that maximum fairly easily.

This is the construction site for the Scanner instance being overflowed:

openai-go/packages/ssestream/ssestream.go

Lines 24 to 38 in c0414f1

func NewDecoder(res *http.Response) Decoder {
if res == nil || res.Body == nil {
return nil
}
var decoder Decoder
contentType := res.Header.Get("content-type")
if t, ok := decoderTypes[contentType]; ok {
decoder = t(res.Body)
} else {
scanner := bufio.NewScanner(res.Body)
decoder = &eventStreamDecoder{rc: res.Body, scn: scanner}
}
return decoder
}

Would you be able to add an option to pass a desried max size as a RequestOption?

@alecrubin alecrubin linked a pull request Apr 15, 2025 that will close this issue
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fix: set max capacity for ssestream decoder bufio scanner alecrubin/openai-go
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@mrene @alecrubin