tokio/tokio-tls/examples/download-rust-lang.rs

#![deny(warnings, rust_2018_idioms)]

use futures::Future;
use native_tls::TlsConnector;
use std::io;
use std::net::ToSocketAddrs;
use tokio::net::TcpStream;
use tokio::runtime::Runtime;
use tokio_io;
use tokio_tls;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let mut runtime = Runtime::new()?;
    let addr = "www.rust-lang.org:443"
        .to_socket_addrs()?
        .next()
        .ok_or("failed to resolve www.rust-lang.org")?;

    let socket = TcpStream::connect(&addr);
    let cx = TlsConnector::builder().build()?;
    let cx = tokio_tls::TlsConnector::from(cx);

    let tls_handshake = socket.and_then(move |socket| {
        cx.connect("www.rust-lang.org", socket)
            .map_err(|e| io::Error::new(io::ErrorKind::Other, e))
    });
    let request = tls_handshake.and_then(|socket| {
        tokio_io::io::write_all(
            socket,
            "\
             GET / HTTP/1.0\r\n\
             Host: www.rust-lang.org\r\n\
             \r\n\
             "
            .as_bytes(),
        )
    });
    let response = request.and_then(|(socket, _)| tokio_io::io::read_to_end(socket, Vec::new()));

    let (_, data) = runtime.block_on(response)?;
    println!("{}", String::from_utf8_lossy(&data));
    Ok(())
}