Detection approach
navigator.mediaDevices.enumerateDevices() returned zero devices, but the User-Agent claims a desktop operating system. Genuine desktop browsers expose at least a default audio input. An empty list indicates a headless or heavily sandboxed automation container.
How this helps detect bots
Collect this signal alongside session context, request metadata, and other independent indicators. A single anomaly is a lead, not a verdict; corroborating anomalies make automated traffic more likely.
Legitimate traffic to consider
Legit users on desktop systems without mic/camera attached, or blocking device access.
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