Expires

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-max-age" 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

See also

• Cache-Control
• Age