Class Server

Ch04/websocket/examples/unresponsive_timer.rs:13–17

const CLIENT_UNRESPONSIVE: Token = Token(1);

struct Server {
    out: Sender,
    ping_timeout: Option<Timeout>,
    client_unresponsive_timeout: Option<Timeout>,
}
impl Handler for Server {
    fn on_open(&mut self, _: Handshake) -> Result<()> {
        println!("Opened a connetion");