Sec,ch,ua,mobile:,?0 Apr 2026

The header sec-ch-ua-mobile: ?0 is a that tells a web server the request is coming from a desktop device .

: Include interactive elements that rely on mouse-hover actions, which don't exist on touchscreens. sec,ch,ua,mobile:,?0

: It is part of the Privacy Sandbox initiative to reduce the information leaked by traditional "User-Agent" strings. The header sec-ch-ua-mobile:

For more technical implementation details, you can refer to the official documentation on MDN Web Docs. Sec-CH-UA-Mobile header - HTTP - MDN Web Docs sec,ch,ua,mobile:,?0

: Serve expansive, multi-column designs rather than single-column mobile stacks.

: Deliver larger images or background videos that might be too heavy for mobile data connections.