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Add note about multiple requests when using incremental static generation (#23190)

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Tim Neutkens 2021-03-18 16:22:29 +01:00 committed by GitHub
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docs/basic-features/data-fetching.md
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@ -355,6 +355,8 @@ When a page with `getStaticProps` is pre-rendered at build time, in addition to
This JSON file will be used in client-side routing through `next/link` ([documentation](/docs/api-reference/next/link.md)) or `next/router` ([documentation](/docs/api-reference/next/router.md)). When you navigate to a page that’s pre-rendered using `getStaticProps`, Next.js fetches this JSON file (pre-computed at build time) and uses it as the props for the page component. This means that client-side page transitions will **not** call `getStaticProps` as only the exported JSON is used.
When using Incremental Static Generation `getStaticProps` will be executed out of band to generate the JSON needed for client-side navigation. You may see this in the form of multiple requests being made for the same page, however, this is intended and has no impact on end-user performance
#### Only allowed in a page
`getStaticProps` can only be exported from a **page**. You can’t export it from non-page files.