How does stale-while-revalidate work in Next.js CDN headers?

When a page is requested after s-maxage expires but within the stale-while-revalidate window, the CDN returns the cached HTML instantly and triggers a single background re-render.

When should you NOT use stale-while-revalidate on a B2B portal?

Never cache private, user-specific financial or session endpoints on a shared public CDN without private cache headers; use SWR on public catalogs and client-side authenticated hooks.

How is this implemented across Vezert B2B web projects?

Every €1,500 landing page, €4,500 corporate website, and €9,000+ web portal we deliver includes full technical validation, 5-locale parity, and 95+ Core Web Vitals.

Stale-While-Revalidate (SWR) Edge Caching

October 16, 2026•4 min read

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