The Sec-CH-UA-Full-Version-List request header field gives a server information about the full version for each brand in its brands list.
As raised in UA-CH Issue 196, Sec-CH-UA-Full-Version can be considered too tightly bound to the primary brand in the brand list, especially for embedders. In order to prevent classes of bugs where a site might think the fictional “Hamburger” browser is not up to date (because its version scheme is different, and lower than Chromium’s), we propose to expose the full version of each brand in the brand list, by requesting this new client hint.
Here’s what that would look like:
Sec-CH-UA-Full-Version-List: “Hamburger”; v="92.0.902.73", "Chromium"; v="92.0.4515.131", "?Not:A Browser"; v="184.108.40.206"
Eventually, it will make sense to deprecate and remove Sec-CH-UA-Full-Version (assuming usage allows us to do so). But we do not intend to do that until we ship its replacement.
Pending (there’s a pre-existing review, and this hint came up in the review process as feedback from other browsers, so the TAG is aware of it).
Edge: This hint was added to solve a bug (maybe a feature request?) by Edge folks.
Gecko: Non-harmful (https://mozilla.github.io/standards-positions/#ua-client-hints)
WebKit: Requested through email
Web developers: No signals
No special DevTools support needed. It should just work™.
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