Sec-CH-UA-Platform
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-Platform user agent client hint request header provides the platform or operating system on which the user agent is running.
For example: "Windows" or "Android".
Sec-CH-UA-Platform 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-Platform: <platform>
Directives
<platform>-
One of the following strings:
"Android","Chrome OS","Chromium OS","iOS","Linux","macOS","Windows", or"Unknown".
Examples
As Sec-CH-UA-Platform is a low entropy hint it is typically sent in all requests.
A browser running on a macOS computer might add the following header to all requests.
Sec-CH-UA-Platform: "macOS"
Specifications
| Specification |
|---|
| User-Agent Client Hints # sec-ch-ua-platform |
Browser compatibility
BCD tables only load in the browser