User-Agent Parser

User-Agent headers identify browser engine, version, operating system, and sometimes device class. Parsers help reproduce customer bugs when support pastes headers from email clients or mobile WebViews.

UA strings are easily spoofed and increasingly frozen or reduced for privacy (Client Hints replace some fields). Do not rely on UA alone for security decisions or feature gating critical paths.

Bot detection needs behavioral signals beyond parsed UA families.

Parse customer UA locally during support calls. Headers may correlate to unreleased beta builds.