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HTTP Upgrade-Insecure-Requests请求头向服务器发送一个信号，表示客户对加密和认证响应的偏好，并且它可以成功处理upgrade-insecure-requests CSP 指令。

Header type	Request header
Forbidden header name	no

句法

Upgrade-Insecure-Requests: 1

例子

客户端向服务器请求它支持以下升级机制的信号upgrade-insecure-requests：

GET / HTTP/1.1 Host: example.com 
Upgrade-Insecure-Requests: 1

服务器现在可以重定向到该网站的安全版本。一个Vary可以使用的头，这样的网站不会被缓存投放到不支持升级机制的客户。

Location: https://example.com/ Vary: Upgrade-Insecure-Requests

产品规格

Specification	Status	Comment
Upgrade Insecure RequestsThe definition of 'upgrade-insecure-requests' in that specification.	Candidate Recommendation	Initial definition.

浏览器兼容性

Feature	Chrome	Firefox	Edge	Internet Explorer	Opera	Safari
Basic Support	44	48.0	(No)1	(No)	31	?

Feature	Android	Chrome for Android	Edge mobile	Firefox for Android	IE mobile	Opera Android	iOS Safari
Basic Support	?	44	(No)	48.0	?	31	?

Under consideration 即将发布

Content-Security-Policy

CSP upgrade-insecure-requests

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