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.
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|
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
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.
A comma separated list of brands in the user agent brand list, and their associated full version number. The syntax for a single entry has the following format:
Sec-CH-UA-Full-Version-List: "<brand>";v="<full version>", ...
A brand associated with the user agent, like "Chromium", "Google Chrome". This may be an intentionally incorrect brand like
" Not A;Brand"or
"(Not(A:Brand"(the actual value is expected change over time and be unpredictable).
A full version number, such as 98.0.4750.0.
A server requests the
Sec-CH-UA-Full-Version-List header by including the
Accept-CH in a response to any request from the client, using the name of the desired header as a token:
HTTP/1.1 200 OK Accept-CH: Sec-CH-UA-Full-Version-List
The client may choose to provide the hint, and add the
Sec-CH-UA-Full-Version-List header to subsequent requests, as shown below:
GET /my/page HTTP/1.1 Host: example.site Sec-CH-UA: " Not A;Brand";v="99", "Chromium";v="98", "Google Chrome";v="98" Sec-CH-UA-Mobile: ?0 Sec-CH-UA-Full-Version-List: " Not A;Brand";v="18.104.22.168", "Chromium";v="98.0.4750.0", "Google Chrome";v="98.0.4750.0" Sec-CH-UA-Platform: "Linux"
|User-Agent Client Hints |
BCD tables only load in the browser