feat: add SWR middleware

[atinux]

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Resolves #32

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Name	Status	Preview	Updated
vue-telescope-website	✅ Ready (Inspect)	Visit Preview	Aug 13, 2022 at 1:16PM (UTC)

[atinux]

Seems that we do have STALE answer 😊

One question @pi0. do you know why the cache-control sent back is not the same as the one defined in setHeader?

[pi0]

It seems to me vercel revalidates in the background since s-maxage is set to 1 and returns a header to invalidate response. Any specific reason you are not using h3 utility?

[atinux]

Because I don't remember the utility to use :sweat_smile:

[pi0]

It is handleCacheHeaders (and should be auto importable with latest nitro) shall I push?

[atinux]

From what I see in https://github.com/unjs/h3/blob/main/src/utils/cache.ts

How would it produce s-maxage=1, stale-while-revalidate=3599 ?

[atinux]

Updated to use handleCacheHeaders @pi0, let me know if good enough to merge now :blush:

[atinux]

Ouppps, I need to handle to disable caching is the user is authenticated :sweat_smile:

[atinux]

Tested and seems to work well now, merging for more testing (it is still not officially released)