A Simple UDP server and client

There are a few semantic differences between the UDP server and the TCP server we wrote earlier. Unlike TCP, UDP does not have a stream structure. This derives from the semantic differences between the two protocols. Let's take a look at what a UDP server might look like:

// chapter3/udp-echo-server.rs

use std::thread;
use std::net::UdpSocket;

fn main() {
    let socket = UdpSocket::bind("0.0.0.0:8888")
                           .expect("Could not bind socket");

    loop {
        let mut buf = [0u8; 1500];
        let sock = socket.try_clone().expect("Failed to clone socket");
        match socket.recv_from(&mut buf) {
            Ok((_, src)) => {
                thread::spawn(move || {
                    println!("Handling connection from {}", src);
                    sock.send_to(&buf, &src)
                        .expect("Failed to send a response");
                });
            },
            Err(e) => {
                eprintln...