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 HTTP Sec-CH-UA-Platform request header is a user agent client hint which 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 request header Yes ( Sec- prefix)
Sec-CH-UA-Platform: <platform><platform>One of the following strings: "Android", "Chrome OS", "Chromium OS", "iOS", "Linux", "macOS", "Windows", or "Unknown".
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"