This HTTP request header tells a server exactly what kind of processor instruction set the browser is running on. When you see Sec-CH-UA-Arch: "x86" , it indicates the device is powered by an Intel or AMD processor, as opposed to "arm" architectures common in mobile devices and newer MacBooks. Why Does It Matter?
Understanding Sec-CH-UA-Arch : The Future of CPU Detection As the web moves away from bulky, privacy-invasive User-Agent strings, a new standard has emerged: . One of the most specific hints for developers today is Sec-CH-UA-Arch , which identifies the underlying CPU architecture of a user's device. What is Sec-CH-UA-Arch: "x86" ? sec,ch,ua,arch:,""x86""
: On the next request, the browser will include: Sec-CH-UA-Arch: "x86" Accessing via JavaScript This HTTP request header tells a server exactly
To see this header in your server logs, you must first "opt-in" by sending an Accept-CH response header to the browser. Understanding Sec-CH-UA-Arch : The Future of CPU Detection
: Unlike the old UA string that sent everything by default, this is a high-entropy hint . It is only sent if the server explicitly asks for it, reducing the "fingerprinting" surface area for casual tracking. How to Implement It
: Your server sends a response with: Accept-CH: Sec-CH-UA-Arch
: If you offer software downloads, you can automatically serve the x86 installer instead of the ARM version without asking the user.
