Next.js ISR (Incremental Static Regeneration)
fallback: blocking (preferred) – when a request is made to a page that hasn't
been generated, Next.js will server-render the page on the first request.
Future requests will serve the static file from the cache.
fallback: true – when a request is made to a page that hasn't been generated,
Next.js will immediately serve a static page with a loading state on the first
request. When the data is finished loading,
the page will re-render using this data and be cached.
Future requests will serve the static file from the cache.
fallback: false ,
then any paths not returned by getStaticPaths will result in a 404 page.