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。
Device-Memory 是一个跟 Device Memory API 相关的请求头，它跟 Client Hints 请求头的作用相似，用来表示客户端设备内存的近似大小。
| Header type | Request header |
|---|---|
| Forbidden header name | ? |
Note: Client Hints are accessible only on secure origins (via TLS). Server has to opt in to receive Device-Memory header from the client by sending Accept-CH and Accept-CH-Lifetime response headers.
语法
设备的内存大小可能会被用作指纹变量，因此将这个取值设置的比较粗糙，以减少滥用它的可能性。 请求头采用以下值：0.25、0.5、1、2、4、8。
Device-Memory: <number>
示例
服务器需要先发送包含 Device-Memory 的 Accept-CH 和 Accept-CH-Lifetime 响应头，来表明可以接收 Device-Memory 请求头.
Accept-CH: Device-Memory Accept-CH-Lifetime: 86400
接下来客户端发送的请求则可能会包含 Device-Memory 请求头:
Device-Memory: 1
规范
| 规范 | 状态 | 注释 |
|---|---|---|
| Device Memory 1 Device-Memory |
Editor's Draft | Initial definition. |
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.
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Device-Memory | Chrome Full support 61 | Edge Full support ≤79 | Firefox ? | IE ? | Opera Full support 48 | Safari ? | WebView Android Full support 61 | Chrome Android Full support 61 | Firefox Android ? | Opera Android ? | Safari iOS ? | Samsung Internet Android Full support 8.0 |
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.