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DPR请求头是“ 客户端提示”消息头，它代表客户端设备的像素比（{{Glossary（“ DPR”）}}}，该比例是与每个CSS像素相对应的物理设备像素的数量。
| Header type | {{Glossary("Request header")}} |
|---|---|
| {{Glossary("Forbidden header name")}} | ? |
Note: Client Hints are accessible only on secure origins (via TLS). Server has to opt in to receive DPR header from the client by sending {{HTTPHeader("Accept-CH")}} and {{HTTPHeader("Accept-CH-Lifetime")}} response headers.
Syntax
DPR: <number>
Examples
Server first needs to opt in to receive DPR header by sending the response headers {{HTTPHeader("Accept-CH")}} containing DPR and {{HTTPHeader("Accept-CH-Lifetime")}}.
Accept-CH: DPR Accept-CH-Lifetime: 86400
Then on subsequent requests the client might send DPR header back:
DPR: 1.0
Browser compatibility
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.
{{Compat("http.headers.DPR")}}
See also
- {{HTTPHeader("Accept-CH")}}
- {{HTTPHeader("Accept-CH-Lifetime")}}
- {{HTTPHeader("Vary")}}