923fdcd2c5
Continuation of https://github.com/vercel/next.js/pull/34498 this updates to send a `purpose: prefetch` header (related [w3c discussion](https://github.com/w3c/resource-hints/issues/74)) when prefetching data routes and then on the server we skip revalidating when this header is set. When a client-transition is actually made we send a background HEAD (non-blocking) request to the data route without the `purpose: prefetch` header which signals a revalidation should occur if the data is stale. This helps alleviate the number of revalidations occurring currently caused by prefetches as a path can be prefetched but not visited during a session so may not need to be revalidated yet. Fixes: https://github.com/vercel/next.js/issues/17758 x-ref: https://github.com/vercel/next.js/discussions/20521 x-ref: [slack thread](https://vercel.slack.com/archives/C031QM96T0A/p1645129445819139?thread_ts=1645124478.067049&cid=C031QM96T0A) |
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