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fix(rag): add sse keepalive heartbeat to prevent nginx 60s timeout #435

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Merged
AndreLiar merged 1 commit into from
Jun 15, 2026
Merged

fix(rag): add sse keepalive heartbeat to prevent nginx 60s timeout #435

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8 changes: 8 additions & 0 deletions backend/controllers/ragController.js
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Original file line number Diff line number Diff line change
Expand Up @@ -84,6 +84,13 @@ export const askQuestionStream = catchAsync(async (req, res) => {
closed = true;
});

// Keep the SSE connection alive through nginx's proxy_read_timeout (default 60s).
// The embedding phase can take minutes on CPU-only ollama — without this, nginx
// kills the idle connection before the first event is ever flushed.
const heartbeat = setInterval(() => {
if (!closed && !res.writableEnded) res.write(': keepalive\n\n');
}, 20000);

try {
await executeRAG({
question,
Expand All @@ -104,6 +111,7 @@ export const askQuestionStream = catchAsync(async (req, res) => {
send('error', { message: 'Stream failed', code: 'STREAM_ERROR' });
}
} finally {
clearInterval(heartbeat);
if (!res.writableEnded) res.end();
}
});
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