[recovery] fix: setRequestLocale ordering in [...slug] generateMetadata (static→dynamic error)#18800
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The catch-all [locale]/[...slug] generateMetadata never called
setRequestLocale before invoking next-intl APIs. getMdMetadata ->
getMetadata calls getTranslations("common"), and the catch block also
calls getTranslations("common"). Without setRequestLocale, next-intl
reads the locale from request headers for on-demand slugs, opting the
route into dynamic rendering and throwing "Page changed from static to
dynamic at runtime ... reason: headers".
Observed in production via /images/videos/Clw-qf1sUZg.jpg, which maps to
the catch-all with locale="images".
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Records the pattern behind recovery PRs #18785/#18797/#18798/#18800 and systemic fix #18811 so future work surfaces it before reintroducing the bug. Every async Server Component page and generateMetadata under app/[locale]/ must call setRequestLocale(locale) before any next-intl API. next-intl's request config resolves the locale via requestLocale, which reads request headers unless setRequestLocale has primed the per-request cache; a next-intl call before priming opts the route into dynamic rendering and, for on-demand params (invalid-locale / unknown-slug bot probes not in generateStaticParams), throws "Page changed from static to dynamic at runtime, reason: headers". The getMetadata/getMdMetadata helpers call getTranslations("common") internally, so priming first is required even when locale is passed to them. Canonical writeup: docs/solutions/architecture/setrequestlocale-static-to-dynamic-rendering.md (discoverable via the learnings-researcher agent). Thin pointers added in docs/best-practices.md (next-intl section) and the design-system skill (references/i18n-rtl.md + SKILL.md rule 5 and load trigger). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Co-Authored-By: wackerow <54227730+wackerow@users.noreply.github.com>
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Production error
grafana-fn-error-page-changed-from-static-to-dynamic-at-runtime-images-videos-clw-qfnsu[ERROR] ⨯ Error: Page changed from static to dynamic at runtime /images/videos/Clw-qf1sUZg.jpg, reason: headersget requestLocale(next-intl).Root cause
/images/videos/Clw-qf1sUZg.jpghas no static asset and falls through to the catch-allapp/[locale]/[...slug]/page.tsxwithlocale="images",slug=["videos","Clw-qf1sUZg.jpg"](a bot/broken-link probe against a YouTube-ID-shaped path).generateMetadatain that route never calledsetRequestLocale(locale)before invoking next-intl APIs:getMdMetadata→getMetadatacallsgetTranslations("common")(src/lib/utils/metadata.ts:66);catchblock also callsgetTranslations("common").Without
setRequestLocale, next-intl falls back to reading the locale from requestheaders()for on-demand slugs (those not covered bygenerateStaticParams), which opts the route into dynamic rendering and throws "Page changed from static to dynamic at runtime … reason: headers".Fix
Add
setRequestLocale(locale)at the top ofgenerateMetadata, before any next-intl call. Same class of fix as #18785 (videos slug), #18797 (wallets), #18798 (resources).Verification
pnpm type-check✅pnpm exec eslinton changed file ✅🤖 Generated with Claude Code