: What is the default behavior of Cache-Control If no private nor public were defined in the cache-control, e.g. Cache-Control: max-age=31461276 What is the expected behavior?

@Kevin317

See www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9.3:
The max-age directive on a response implies that the response is cacheable
(i.e., "public") unless some other, more restrictive cache directive is
also present.


It's conceivable (likely?) that there are proxies in the wild which break this but since the only failure mode could be treating a public resource as private the consequences should be minimal beyond a modest performance hit. You'll have far more problems with proxies which do things like cache resources far beyond your specified max-age.

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@Martha676

It seem it tells browser that the cache expires after 1 year, 31461276 seconds means 1 year.

More details in this post: EXPIRES VS. MAX-AGE

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