pub trait ConnectSvc {
type Connection: AsyncRead + AsyncWrite + Connection + Unpin + Send + 'static;
type Error: Into<Box<dyn StdError + Send + Sync>>;
type Future: Future<Output = Result<Self::Connection, Self::Error>> + Unpin + Send + 'static;
// Required method
fn connect(self, internal_only: Internal, dst: Uri) -> Self::Future;
}