Expires - HTTP 编辑
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 aCache-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
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The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
See also
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