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Josh Harris 2d6342cd22 Add stale-if-error to app shell Cache-Control (#4009)
## Description:

Adds `stale-if-error=86400` to the `Cache-Control` header set on the
rendered app shell (`/`) in
[src/server/RenderHtml.ts](src/server/RenderHtml.ts). This lets shared
caches (CloudFlare, nginx `proxy_cache`) keep serving the last good
`index.html` for up to 24h if origin returns a 5xx, alongside the
existing `stale-while-revalidate` window.

Pairs with enabling HTML caching for the `/` route on CloudFlare in
"respect origin headers" mode — it already honors `s-maxage` (5 min edge
TTL) and `stale-while-revalidate`; this just extends the same safety net
to origin-error cases.

No behavior change for successful responses; browsers still revalidate
every load via `max-age=0`.

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

jish

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Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-25 21:13:48 +01:00
..
2026-05-22 13:19:22 +01:00
2026-05-11 19:27:02 -07:00
2026-03-17 15:55:47 -07:00