The Edge is just designed for live streaming, that is RTMP, so the Edge only supports RTMP/HTTP-FLV. Neither WebRTC nor HLS is not supported by Edge, it's the features of Origin.

The cluster for HLS is regular HTTP file-based server, like Nginx or ATS. And cluster for WebRTC is called Cascading over QUIC, it's actually an OriginCluster connected with QUIC not RTMP.

Right now, most of WebRTC server does not support cluster, or does not work well, because WebRTC is too complex. We need time to design the arch carefully, especially we support both live streaming and WebRTC.

Note that TURN server is also could use as "Edge-like" for WebRTC origin server, but it does not support stream aggregation, which means it by-pass all connections and streams to SRS, so it won't help to extend the capability, it only works as a "by-pass proxy" over TCP or UDP. In one word, TURN is not a WebRTC cluster, it's a proxy near user to improve the network quality.

We may support WebRTC cluster, the OriginCluster over QUIC, in SRS 5.0 or later. It depends on our time resource, and whether we get a stable and simple enough arch.

The arch for WebRTC Cluster：

No edge for WebRTC.
Origin works for LiveStreaming and WebRTC, it holds the stream.
The OriginCluster for LiveStreaming is based on RTMP302, while OriginCluster for WebRTC is based on QUIC.

Uh oh!

WebRTC：Support Cluster over QUIC. #2091

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