This is something browsers can now handle with headers, but I think it could be something we support wherever Cachebox cache settings exist too… especially with ColdBox Async features now.

You can set expiration time, and if you want to support stale-while-revalidate, you can set that too.

cache-control: private, max-age=900, stale-while-revalidate=3600

After the cache time has passed but within the window it’s safe to store stale data, Serve them the last cached version quickly but async get and save a new version for the cache so the next request is still fast and is fresh.

Here is a podcast from Syntax.fm that explains it pretty well, pros and cons.

https://podcasts.apple.com/us/podcast/syntax-tasty-web-development-treats/id1253186678?i=1000634614922

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