User agents help servers deliver appropriate content and detect bots.
Format
Mozilla/5.0 (Windows NT 10.0; Win64; x64)
AppleWebKit/537.36 (KHTML, like Gecko)
Chrome/120.0.0.0 Safari/537.36
Information revealed
- Browser name and version.
- Operating system.
- Device type (mobile, tablet, desktop).
- Rendering engine (WebKit, Gecko, Blink).
Use cases
- Serve mobile vs desktop layouts.
- Browser feature detection.
- Analytics and tracking.
- Bot detection and blocking.
Security considerations
- Easily spoofed (not reliable for security).
- Can be used for fingerprinting.
- Privacy concern (reveals system details).
- Should never be sole authentication factor.
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