Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
The Sec-CH-UA-Full-Version-List user agent client hint request header provides the user-agent's branding and full version information.
| Header type | Request header, Client hint |
|---|---|
| Forbidden header name | yes |
The Sec-CH-UA-Full-Version-List header provides the brand and full version information for each brand associated with the browser, in a comma-separated list.
A brand is a commercial name for the user agent like: Chromium, Opera, Google Chrome, Microsoft Edge, Firefox, and Safari. A user agent might have several associated brands. For example, Opera, Chrome, and Edge are all based on Chromium, and will provide both brands in the Sec-CH-UA-Full-Version-List header.
The header therefore allows the server to customize its response based on both shared brands and on particular customizations in their specific respective builds.
The header may include "fake" brands in any position and with any name. This is a feature designed to prevent servers from rejecting unknown user agents outright, forcing user agents to lie about their brand identity.
Note: This is similar to Sec-CH-UA, but includes the full version number instead of the significant version number for each brand.