pub trait ResolverProxyInterface: Send + Sync {
type ResolveHostNameResponseFut: Future<Output = Result<(Option<Box<Ipv4Address>>, Option<Box<Ipv6Address>>), Error>> + Send;
// Required method
fn resolve_host_name(
&self,
host: &str,
timeout: i64,
) -> Self::ResolveHostNameResponseFut;
}