* fix(api): close HEAD requests immediately instead of hanging (#6400)
Next.js 16's App Router route-handler pipeline (send-response.js) already
skips piping a Response body for HEAD, but its page-rendering pipeline
(pipe-readable.js -> pipeToNodeResponse, used for every app-router page/layout
render, including the not-found boundary any unmatched path falls through to)
has no such check and always streams the full rendered body regardless of
method. Combined with Node's default keep-alive framing, this left some
clients unsure whether the (implicitly bodyless) HEAD response had actually
finished.
Add scripts/dev/head-response-guard.cjs, wired into both the dev/start custom
server (run-next.mjs) and the packaged standalone server
(standalone-server-ws.mjs) at the same tier as the existing
http-method-guard.cjs/peer-stamp.mjs wrappers: for every inbound HEAD request
it discards any body bytes the inner handler writes and forces
Connection: close once .end() is called, independent of route existence or
auth state.
Regression guard: tests/unit/head-request-closes-6400.test.ts
* chore(changelog): restore #6400 bullet before re-sync
* chore(sync): merge release tip + restore #6608 bullet
* chore(sync): merge release tip + restore #6400 bullet
* chore(changelog): re-sync after release merge — preserve #6574 rerank bullet
Co-authored-by: diegosouzapw <8016841+diegosouzapw@users.noreply.github.com>
