nestjs / nest / cea989a8-bead-442a-8b00-1300fe3a5e29

90%

master: 90%

Pull #16753

circleci

fix(core): defer sse writehead until after lifecycle completes

SSE returned HTTP 200 on ValidationPipe errors because SseStream.pipe() called writeHead before pipes ran inside the cold interceptor Observable.

- SseStream: defer writeHead to commitHeaders() (and _transform when data flows)
- RouterResponseController.sse(): catchError re-throws before headers commit;
  pipe(..., { end: false }); setTimeout(0) commitHeaders after subscribe
- RouterExecutionContext: pass statusCode and getHeaders() at handle time
- Unit tests and Express/Fastify integration tests (400 before stream opens)

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