freno-dev

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Michael Freno 687df016a6 nook: defer the SSR stream until the appcast resolves on /changelog

Every cold origin render of /changelog died with ERR_HTTP_HEADERS_SENT:
the pending createAsync at the top of NookChangelogPage suspended the
whole component before <EdgeCacheHeaders> rendered, the shell flushed
while the S3 appcast fetch was in flight, and the boundary re-render
then called setResponseHeader on an already-sent response. Warm renders
hid it because the appcast's 5-minute module cache resolved in a
microtask; fresh Vercel isolates and cache expiry hit the crash, which
is why refreshes and direct navigation failed while in-app Links worked.

deferStream holds the stream until the releases resolve, so HttpHeader
always runs pre-flush. The S3 latency lands on origin renders only,
which the page's CDN-Cache-Control s-maxage=300 already keeps rare.

Tests: local prod-build cold-start loop (build + curl /nook/changelog),
red 3/3 before, green 5/5 after; stack identical to the prod trace.

Fixes FRE-112

2026-10-05 12:40:44 -04:00