Sec,ch,ua:,""microsoft,edge"";v=""107"",,""chromium"";v=""107"",,""not=a?brand"";v=""24"" Apr 2026

The string you've shared is a header, typically used by browsers like Microsoft Edge to identify themselves to web servers without revealing the excessive detail often found in traditional User-Agent strings.

: The Not=A?Brand entry is a "fake" brand added to the browser's identification list. Its purpose is to "grease" the ecosystem—forcing web developers to write code that can handle unexpected or unknown browser names. The string you've shared is a header, typically

: The "grease" brand used to ensure servers handle arbitrary brand strings correctly. : The "grease" brand used to ensure servers

: This header is part of a broader move by Google and Microsoft to phase out the standard User-Agent string, which contains too much information that can be used for "fingerprinting" (tracking users without cookies). Breakdown of Your Specific String: By including a randomized string like Not=A

: Historically, websites would break if they didn't recognize a browser. By including a randomized string like Not=A?Brand , browsers ensure that servers don't rely on a fixed, "perfect" list of brands, which prevents future-proofing issues.

: Identifies the primary brand and major version.