cherry-pick sitemap route handler → main - #1484
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Next Metadata routes ignore next.config.ts headers() — the previous sitemap.ts left Next in charge of the response headers and hard-coded Cache-Control: public, max-age=0, must-revalidate on force-dynamic sitemaps. Every crawler hit re-ran the full loader chain (x-vercel-cache: MISS observed on prod 2026-07-26 after PR #1473 landed the config-level attempt). Confirmed by curl: my next.config /sitemap.xml rule was silently dropped. Move the builder logic to src/lib/sitemap-builder.ts and add a Route Handler at src/app/sitemap.xml/route.ts that returns a raw Response with: Content-Type: application/xml Cache-Control: public, s-maxage=3600, stale-while-revalidate=86400 Same builder logic, same buildFullSitemap + buildStaticFallback, just serialized to XML in the route and shipped with a real edge cache header. Also drop the now-redundant /sitemap.xml rule from next.config headers(). Co-authored-by: Florent Tapponnier <contact@mobula.io>
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Cherry-pick of #1483 (dev). Fixes the sitemap Cache-Control that #1474 couldn't hit via next.config headers() — route.ts handler now sets the header directly via Response.