学习Rust编程-TCP

use std::io::prelude::*;
use std::net::TcpStream;

fn main() -> std::io::Result<()> {
  let mut connection =
    TcpStream::connect("www.rustinaction.com:80")?; 
  connection.write_all(b"GET / HTTP/1.0")?; 
  connection.write_all(b"r
")?; 
  connection
    .write_all(b"Host: www.rustinaction.com")?; 
  connection.write_all(b"r
r
")?; 
  std::io::copy(
    &mut connection,
    &mut std::io::stdout(),
  )?; 
  Ok(())
}