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Web Frontend2026-05-17

ISR (Incremental Static Regeneration)

Also known as: Incremental Static Regeneration / インクリメンタル静的再生成

A hybrid of SSG and SSR introduced by Next.js. A per-page revalidate interval triggers background HTML regeneration after the set time, updating content without a full rebuild.


Overview

With 'revalidate: 3600', requests within that window return cached HTML, and the first request after expiry triggers a background regeneration. On-Demand ISR allows immediate regeneration triggered by CMS content updates.

Behavior on Vercel

On Vercel, ISR-regenerated pages are cached across the edge network for globally low-latency delivery. The Vercel + Next.js 16 guide explains caching strategy in depth.

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