Upgrade-Insecure-Requests request header sends a signal to the server expressing the client's preference for an encrypted and authenticated response, and that it can successfully handle the
upgrade-insecure-requests CSP directive.
A client's request signals to the server that it supports the upgrade mechanisms of
GET / HTTP/1.1 Host: example.com Upgrade-Insecure-Requests: 1
The server can now redirect to a secure version of the site. A
Vary header can be used so that the site isn't served by caches to clients that don't support the upgrade mechanism.
Location: https://example.com/ Vary: Upgrade-Insecure-Requests
|Upgrade Insecure Requests |
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