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Comment on context of cache-control

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Sam Carlton 2022-06-15 13:22:18 -05:00
parent 53feb3c100
commit 6c7cbf5782
1 changed files with 8 additions and 0 deletions
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8
helpers/astro/request.js
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@ -38,6 +38,14 @@ function getMaxAgeForUrl ( Astro ) {
export async function applyResponseDefaults ( Astro ) {
const maxAgeSeconds = getMaxAgeForUrl( Astro )
// 'stale-while-revalidate' tells Cloudflare to cache the response for X seconds
// but update the cache in the background
// so the user always gets a fast and cached response.
//
// This also means our Astro SSR entry function on Netlify
// only gets called from Cloudflare instead of the user's browser
// so that our actual number of requests to Netlify are minimized.
//
// Cache-Control: s-maxage=1, stale-while-revalidate
Astro.response.headers.set( 'Cache-Control', `s-maxage=${ maxAgeSeconds }, stale-while-revalidate` )
}