# NousResearch/hermes-agent · SSE header flushing and CORS fixes for run events

## Open now

- Nothing open on GitHub.

These items address SSE response headers not being flushed immediately on the run-events endpoint, causing clients to appear hung, along with related CORS and tool failure reporting concerns. The work spans gateway and API server layers.

## TL;DR

- 3 member(s): 0 open issue(s), 1 closed issue(s), 0 open PR(s), 1 merged PR(s), 1 PR(s) closed without merging.
- A fix was merged to main in PR #121745. Verify it addresses your case.
- **Recommended:** read PR #121745 (and any competing PRs below) before filing. Confirm the merged change covers your symptom.

## Maintainer resolution verdict

- Internal-tracker verdict over this cluster's issue members: `resolved` · deciding PR(s): `pr-121745`. This is distinct from the fix status above. Weigh it yourself.

## How this cluster was grouped

- Link evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.
- Pairwise link density `0.67`: the share of member pairs that carry a link, counting a structural link in full and a relevance-only link at 0.36. `1.00` means every pair is linked.

## Closed / duplicate issues

- #80757: SSE response headers not flushed in _handle_run_events — clients appear hung for up to 30s

## Prior & competing PRs

- **#121745: fix(api-server): CORS on every SSE stream, flush run-events head, report failed tools as tool.failed**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `contributors/emails/195337306+0xGr1mm@users.noreply.github.com`, `gateway/platforms/api_server.py`, `gateway/platforms/api_server_openai_routes.py`, `gateway/platforms/api_server_runs.py`, `tests/gateway/test_api_server.py`, `tests/gateway/test_api_server_runs.py`, `tests/gateway/test_session_api.py`, `website/docs/user-guide/features/api-server.md`
- **#80871: fix(gateway): flush SSE response headers immediately on /v1/runs/events (#80757)**. closed without merge
  - maintainer direction: category `duplicate_of`; implication `duplicate`; refs `#80776`

## Fix status

- Merged to main in PR #121745 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-09-25`.
- Subsystem: `gateway`