Expires

Caching

Specifies a date/time after which the response is considered stale. Superseded by Cache-Control max-age.

Syntax

Expires: &lt;http-date&gt;

Expires: Thu, 12 Mar 2027 10:00:00 GMT

Expires specifies an absolute date after which the response is stale. Original HTTP/1.0 caching mechanism.

When both Cache-Control: max-age and Expires are present, Cache-Control takes precedence.

Limitation: requires synchronized clocks. Cache-Control: max-age (relative time) is preferred.

Home-page responses of 501 popular sites from the enterno.io /check catalogue, checked in the last 30 days.

28.9% (145 of 501) send Expires.

Check if your website sends this header correctly