Upgrade-Insecure-Requests

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 Status Comment
Upgrade Insecure Requests
upgrade-insecure-requests		 Candidate Recommendation Initial definition.

浏览器兼容性

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Upgrade-Insecure-RequestsChrome Full support 44Edge Full support 17Firefox Full support 48IE No support NoOpera Full support 31Safari Full support 10.1WebView Android Full support 44Chrome Android Full support 44Firefox Android Full support 48Opera Android Full support 32Safari iOS Full support 10.3Samsung Internet Android Full support 4.0

Legend

Full support  
Full support
No support  
No support

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