Next 15 flips GET Route Handlers and fetch to uncached unless you opt in — subtle upgrade gotcha.
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Caching defaults in Next 15 — what is no longer cached by default?
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cachingnextjs-15
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Next 15 makes fetch and GET Route Handlers dynamic by default — add cache: 'force-cache' / 'use cache' or export const dynamic = 'force-static' to re-cache.
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Dossier 22 of 95 decoded in the Next.js track. One more won't hurt.