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fix(stream): prevent non-JSON SSE lines and duplicate [DONE] from breaking clients

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- Passthrough: skip non-JSON data lines instead of forwarding raw garbage
- Translate: stop emitting redundant [DONE] sentinel (message_stop terminates)
- Add streamDoneSent flag to prevent duplicate [DONE] across transform + flush
- Warn on unexpected upstream Content-Type for streaming responses

PR #2046 by @qianze0628

Co-authored-by: Cursor <cursoragent@cursor.com>
This commit is contained in:
qianze
2026-06-26 10:22:53 +07:00
committed by decolua
co-authored by Cursor
parent 0d21668917
commit c22f11de38
2 changed files with 26 additions and 12 deletions
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open-sse/handlers/chatCore/streamingHandler.js
+8
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@@ -52,6 +52,14 @@ export function handleStreamingResponse({ providerResponse, provider, model, sou
});
}
// Warn when upstream returns unexpected Content-Type for a streaming response.
// This often means the provider returned an HTML error page or plain-text error
// that the SSE transform stream would forward as garbage to the client.
const upstreamContentType = (providerResponse.headers.get('content-type') || '').toLowerCase();
if (upstreamContentType && !upstreamContentType.includes('text/event-stream') && !upstreamContentType.includes('application/json')) {
console.warn('[STREAM] ' + provider + ' | ' + model + ' | unexpected Content-Type: ' + upstreamContentType);
}
const transformStream = buildTransformStream({ provider, sourceFormat, targetFormat, userAgent, reqLogger, toolNameMap, model, connectionId, body, onStreamComplete, apiKey });
// Responses passthrough: synthesize response.failed + [DONE] if the stream aborts/stalls before a terminal event