echo.rs

use std::io::{Read, Write};
use std::net::TcpListener;

fn main() {
    let listener = TcpListener::bind("127.0.0.1:8080").unwrap();

    for stream in listener.incoming() {
        let mut stream = stream.unwrap();
        std::thread::spawn(move || loop {
            let mut buf = [0 as u8; 1024];
            let n = stream.read(&mut buf).unwrap();
            if n == 0 {
                break;
            }
            stream.write(&buf[..n]).unwrap();
        });
    }
}