Does Cache-Control s-maxage header override Expires header for browser cache?

Question

I want to set a far future Expires headers to reduce requests made from individual browsers.

I'd also like to set Cache-Control: s-maxage=600 so that proxy caches (and CDNs) revalidate with the origin every 10 minutes for fresh content.

Will browsers honour the Expires header despite the existence of a Cache-Control header (which supposedly supersedes it) with a s-maxage directive?

look this answer http://stackoverflow.com/questions/3740952/difference-between-three-htaccess-expire-rules/3746325#3746325 — secondflying, Sep 18 '12 at 15:09
You can see HTTP specification. "The s- maxage directive is always ignored by a private cache." http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9.3 — secondflying, Sep 18 '12 at 22:53

score 2 · Answer 1 · answered Mar 20 '15 at 12:49

If a response includes both an Expires and a Cache-Control max-age directive, the max-age overrides the Expires header, even if the Expires header is more restrictive. This rule allows an origin server to provide, for a given response, a longer expiration time to an HTTP/1.1 cache than to an HTTP/1.0 cache.

Source: http://condor.depaul.edu/dmumaugh/readings/handouts/SE435/HTTP/node24.html

score -2 · Answer 2 · answered Jul 05 '13 at 15:59

-2

If both are included then both will be checked, neither has precedence. Max-age does not supersede expires, it's additional.

answered Jul 05 '13 at 15:59

David Merrilees

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It's not wrong, test for yourself. Cache-control is newer and has more options, but it doesn't override Expires, both are checked. – David Merrilees Oct 23 '14 at 11:16
What does it do if the values conflict? The browser has to choose one, and that one is Cache-Control. – Fabien Warniez Oct 23 '14 at 18:11

Does Cache-Control s-maxage header override Expires header for browser cache?

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