Sec-CH-UA-Mobile
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-Mobile user agent client hint request header indicates whether the browser is on a mobile device.
It can also be used by a desktop browser to indicate a preference for a "mobile" user experience.
Sec-CH-UA-Mobile is a low entropy hint.
Unless blocked by a user agent permission policy, it is sent by default, without the server opting in by sending Accept-CH.
| Header type | Request header, Client hint |
|---|---|
| Forbidden header name | yes |
Syntax
Sec-CH-UA-Mobile: <boolean>
Directives
<boolean>-
?1indicates that the user-agent prefers a mobile experience (true).?0indicates that user-agent does not prefer a mobile experience (false).
Examples
As Sec-CH-UA-Mobile is a low entropy hint it is typically sent in all requests.
A desktop browser would usually send requests with the following header:
Sec-CH-UA-Mobile: ?0
A browser on a mobile device would usually send requests with the following header:
Sec-CH-UA-Mobile: ?1
Specifications
| Specification |
|---|
| User-Agent Client Hints # sec-ch-ua-mobile |
Browser compatibility
BCD tables only load in the browser