Expires 响应头包含日期/时间， 即在此时候之后，响应过期。无效的日期，比如 0, 代表着过去的日期，即该资源已经过期。
如果在Cache-Control响应头设置了 "max-age" 或者 "s-max-age" 指令，那么 Expires 头会被忽略。
| Header type | Response header |
|---|---|
| Forbidden header name | no |
| CORS-safelisted response-header | yes |
语法
Expires: <http-date>
指南
- <http-date>
-
一个 HTTP-日期 时间戳
示例
Expires: Wed, 21 Oct 2015 07:28:00 GMT
规范
| Specification | Title |
|---|---|
| RFC 7234, section 5.3: Expires | Hypertext Transfer Protocol (HTTP/1.1): Caching |
浏览器兼容性
本页面的兼容表格是由结构化数据生成的。 如果您想帮助我们完善，可以checkout https://github.com/mdn/browser-compat-data 然后给我们发送pull请求
Update compatibility data on GitHub
| Desktop | Mobile | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Basic support | Chrome Full support Yes | Edge Full support Yes | Firefox Full support Yes | IE Full support Yes | Opera Full support Yes | Safari Full support Yes | WebView Android Full support Yes | Chrome Android Full support Yes | Edge Mobile Full support Yes | Firefox Android Full support Yes | Opera Android Full support Yes | Safari iOS Full support Yes | Samsung Internet Android Full support Yes |
Legend
- Full support
- Full support