How to check if WebRTC uses a relay server?

Question

I read that WebRTC uses relay servers, if the direct peer connection doesn't work because of firewalls.

Is there a way to check, if this is the case?

Answer 1

In chrome. go to chrome://webrtc-internals, go to succeeded connection-googCandidate pair(in black letters) check if googLocalcandidatetype is relay, then webrtc uses relay connection . If googLocalcandidatetype is local, then it uses peer to peer connection In firefox, go to about:webrtc, if the succeeded connection contains any candidate as relayed-udp, then webrtc uses relay connection