The Expires HTTP header contains the date/time after which the response is considered expired.
Invalid expiration dates with value 0 represent a date in the past and mean that the resource is already expired.
Note: If there is a Cache-Control header with the max-age or s-maxage directive in the response, the Expires header is ignored.
| Header type | Response header |
|---|---|
| Forbidden header name | no |
| CORS-safelisted response header | yes |
Expires: <http-date>
An HTTP-date timestamp.
Expires: Wed, 21 Oct 2015 07:28:00 GMT
| Specification |
|---|
| HTTP Caching # field.expires |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
Expires |
Yes |
12 |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
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https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Expires