pub trait PingProxyInterface: Send + Sync {
    type PingResponseFut: Future<Output = Result<String, Error>> + Send;
    // Required method
    fn ping(&self, ping: &str) -> Self::PingResponseFut;
}pub trait PingProxyInterface: Send + Sync {
    type PingResponseFut: Future<Output = Result<String, Error>> + Send;
    // Required method
    fn ping(&self, ping: &str) -> Self::PingResponseFut;
}