fn main() {
    let listener = TcpListener::bind("127.0.0.1", 80);

    // bind the listener to the specified address
    let mut acceptor = listener.listen(); //unwrap() here

    fn handle_client(mut stream: TcpStream) {
        println!("a");
    }
    // accept connections and process them, spawning a new tasks for each one
    for stream in acceptor.incoming() {
        match stream {
        Err(e) => { /* connection failed */ }
        Ok(stream) =>
            spawn(proc() {
                // connection succeeded
                handle_client(stream)
            })
        }
    }
    // close the socket server
    drop(acceptor);
}