stale-if-error support

Vercel CDN now supports the stale-if-error Cache-Control directive, serving previously cached responses during 500 errors, network failures, or DNS errors.

Vercel | In Edition 21, Saturday 14 Feb 2026

SOURCE Vercel, stale-if-error Cache-Control header is now supported

Added to The Deploy Log Tuesday 15 Sep 2026, updated Thursday 17 Sep 2026. Read Edition 21, the edition that carried it.

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