Iroh uses QUIC connections and uses the EndpointId, the public ed25519 key, in the TLS handshake for authentication. This makes it impossible for a server to try and machine-in-the-middle the connection.
iroh is an open source library. The relay servers are open source too but number0 runs public, rate limited, relay servers that can be used by everyone. The commercial offerings are for dedicated relay servers and more insight into your network.
It's extremely subtle, fooled me initially too. The `fn handle_connection` takes a different argument, so rust `Derefs` the `ConnectionRef` into `Connection` for the first example. A bit too subtle to my liking.
That's interesting, because the connection to the relay server is established using HTTP1.1 over TLS. Followed by a WebSocket upgrade. It should look like any other webserver connection on the internet. Could be worth investigating your network conditions and filing an issue for this.