Next.js caching header explains why pages don't update after deployment

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The x-nextjs-cache header reveals why updated Next.js pages may not show changes immediately after deployment. A STALE response indicates the page is serving cached content while regeneration occurs in the background. Developers often misinterpret stale content as bugs when the system is actually working as designed. The article advises checking this header before debugging to distinguish between caching behavior and actual deployment failures.

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