Secure context
This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
这是一个实验中的功能
此功能某些浏览器尚在开发中，请参考浏览器兼容性表格以得到在不同浏览器中适合使用的前缀。由于该功能对应的标准文档可能被重新修订，所以在未来版本的浏览器中该功能的语法和行为可能随之改变。
服务器设置Accept-CH-Lifetime标头以指定Accept-CH标头值的持久性，该值指定客户端应在后续请求中包括哪些Client Hints标头。
| Header type | Response header |
|---|---|
| Forbidden header name | ? |
注意: Client Hints只能在安全源（通过TLS）上访问。所有安全的请求都应该持久化Accept-CH和Accept-CH-Lifetime头，以确保Client Hints可靠地发送。
语法
Accept-CH-Lifetime: <age>
示例
Accept-CH: Viewport-Width, DPR Accept-CH-Lifetime: 86400
浏览器兼容性
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.
Update compatibility data on GitHub
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Accept-CH-Lifetime | Chrome Full support 67 | Edge ? | Firefox ? | IE ? | Opera Full support 54 | Safari ? | WebView Android Full support 67 | Chrome Android Full support 67 | Firefox Android ? | Opera Android ? | Safari iOS ? | Samsung Internet Android Full support 9.0 |
Legend
- Full support
- Full support
- Compatibility unknown
- Compatibility unknown
- Experimental. Expect behavior to change in the future.
- Experimental. Expect behavior to change in the future.