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The HTTP 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.
| Header type | Request header |
|---|---|
| Forbidden header name | no |
Syntax
Upgrade-Insecure-Requests: 1
Examples
A client requests signals to the server that it supports the upgrade mechanisms of upgrade-insecure-requests:
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
Specifications
| Specification | Status | Comment |
|---|---|---|
| Upgrade Insecure Requests The definition of 'upgrade-insecure-requests' in that specification. |
Candidate Recommendation | Initial definition. |
Browser compatibility
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
| Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | 44 | 17 | 48 | No | 31 | 10.1 |
| Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | Opera Android | iOS Safari | Samsung Internet |
|---|---|---|---|---|---|---|---|
| Basic support | ? | 44 | No | 48 | 31 | 10.3 | 4.0 |
See also
Content-Security-Policy- CSP
upgrade-insecure-requestsdirective