Upgrade-Insecure-Requests
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2018年4月.
Upgrade-Insecure-Requests 是一个请求首部，用来向服务器端发送信号，表示客户端优先选择加密及带有身份验证的响应，并且它可以成功处理 upgrade-insecure-requests CSP 指令。
| Header type | Request header |
|---|---|
| Forbidden header name | no |
语法
Upgrade-Insecure-Requests: 1
示例
客户端向服务器端发送信号表示它支持 upgrade-insecure-requests 的升级机制：
GET / HTTP/1.1 Host: example.com Upgrade-Insecure-Requests: 1
服务器现在可以重定向到这个站点的安全版本。在响应中可以添加一个 Vary 首部，这样的话，响应就不会被缓存服务器提供给不支持升级机制的客户端了。
Location: https://example.com/ Vary: Upgrade-Insecure-Requests
规范
| Specification |
|---|
| Upgrade Insecure Requests # preference |
浏览器兼容性
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参见
Content-Security-Policy- CSP
upgrade-insecure-requestsdirective