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Syntax

Cache-Control: max-age=3600, must-revalidate

public

Browsers and proxies may cache the response.

private

Browsers are permitted to cache the response, however proxies may not.

no-cache

Browsers and proxies should re-validate the response before serving a cached copy. Browsers have recently started treating this directive like no-store due to improper use.

no-store

Browsers and proxies must not serve or store the response, use for sensitive information.

max-age=[seconds]

Maximum freshness age in seconds. If seconds has exceeded the browser must re-validate with the server.

s-maxage=[seconds]

Similar to max-age except that it applies only to proxy caches.

must-revalidate

Insist that a browser must re-validate with the server. This is more explicit than no-cache.

proxy-revalidate

Similar to must-revalidate however targetting proxies. It insists that a proxy server must re-validate however a browser does not. This is useful when an authenticated page is cached in the browser, and you do not want proxies to cache and serve the response.

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