Next.js rewrites() buffer HTTP responses and drop long-lived connections,
making SSE (text/event-stream) impossible. The backend never even received
the request (no log entry in API, ECONNRESET in web proxy logs).
Create dedicated route.ts files for all 3 SSE endpoints:
- /api/v1/ppt/outlines/stream/[id]
- /api/v1/ppt/presentation/stream/[id]
- /api/v1/ppt/jobs/[job_id]/stream
Each route forwards cookies for auth and returns backend's ReadableStream
directly as a Response, preventing any buffering. Sets X-Accel-Buffering: no
to also disable nginx buffering.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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