# NousResearch/hermes-agent · MCP strict_redirect_headers enforcement bug and fix

## Open now

- Nothing open on GitHub.

A bug was identified where \`strict_redirect_headers\` \`failed\` to strip configured headers on cross-origin redirects, including the MCP preflight probe. Related fixes address enforcing this stripping behavior correctly.

## 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 #116738. Verify it addresses your case.
- **Recommended:** read PR #116738 (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-116738`. 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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

- #115155: \[Bug\]: strict_redirect_headers never strips configured headers — dead response hook — and MCP preflight probe leaks configured headers across redirects

## Prior & competing PRs

- **#116738: fix(mcp): strict_redirect_headers really strips configured headers on cross-origin redirects, preflight probe included (#115155, salvage #115158)**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `tests/tools/test_mcp_preflight_content_type.py`, `tests/tools/test_mcp_tool.py`, `tools/mcp_tool_errors.py`, `tools/mcp_tool_server_run.py`, `tools/mcp_tool_transport.py`
- **#115158: fix(mcp): enforce strict_redirect_headers on redirects and the preflight probe**. closed without merge
  - maintainer direction: category `merged_via`; implication `superseded`; refs `3ac4f26f54c2`, `#116738`, `#115155`, `#115158`

## Fix status

- Merged to main in PR #116738 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-09-20`.