pub(crate) const HEARTBEAT_EVERY: Duration;Expand description
How often a connection is asked to prove it is still there.
The socket carried no keepalive, so a peer that vanished without closing - a slept machine, a wedged process, a network that went away - left its viewer attached and any companion waiting, with neither side told the other was gone. Every WebSocket client answers a Ping without its app’s involvement, so the answer is the proof.