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The Expires header contains the date/time after which the response is considered stale.

Invalid dates, like the value 0, represent a date in the past and mean that the resource is already expired.

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

Syntax

Expires: <http-date>

Directives

<http-date>

An HTTP-date timestamp.

Examples

Expires: Wed, 21 Oct 2015 07:28:00 GMT

Specifications

Specification Title
RFC 7234, section 5.3: Expires Hypertext Transfer Protocol (HTTP/1.1): Caching

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support Yes Yes Yes Yes Yes Yes
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes Yes Yes Yes Yes Yes Yes

See also

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このページの貢献者: AndrzejSala, meridius, fscholz
最終更新者: AndrzejSala,