Tests real-time transport egress channels that operate outside the HTTP request pipeline: full WebRTC ICE/STUN/TURN candidate negotiation, data channel establishment, WebRTC RTCDataChannel over TURN relay, and WebTransport (QUIC-based transport).

These channels are especially dangerous in embedded WebViews because they use UDP (STUN/TURN/QUIC) which may bypass HTTP-level filters entirely. ICE candidate leakage via srflx (server-reflexive) confirms STUN connectivity; a relay candidate confirms TURN relay connectivity. WebTransport connects over HTTP/3 on port 443 but uses QUIC, which some filters do not inspect.