DPR

安全上下文: 此项功能仅在一些支持的浏览器安全上下文(HTTPS)中可用。

实验性: 这是一项实验性技术
在将其用于生产之前,请仔细检查浏览器兼容性表格

**DPR**请求头是“ 客户端提示” (en-US)消息头,它代表客户端设备的像素比 (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 Request header
Forbidden header name ?

备注: Client Hints are accessible only on secure origins (via TLS). Server has to opt in to receive DPR header from the client by sending Accept-CH and Accept-CH-Lifetime response headers.

语法

DPR: <number>

示例

Server first needs to opt in to receive DPR header by sending the response headers Accept-CH containing DPR and Accept-CH-Lifetime.

Accept-CH: DPR
Accept-CH-Lifetime: 86400

Then on subsequent requests the client might send DPR header back:

DPR: 1.0

浏览器兼容性

BCD tables only load in the browser

参见