【Rust】RustでWebサーバを作る

$ cargo new hello –bin

use std::net::TcpListener;

fn main() {
    let listner = TcpListener::bind("127.0.0.1:7878").unwrap();

    for stream in listner.incoming() {
        let stream = stream.unwrap();
        println!("Connection established!");
    }
}

ターミナルから、リクエストを送信する
$ ping http://127.0.0.1:7878/
ping: http://127.0.0.1:7878/: Name or service not known

すると、サーバ側では、
Running `target/debug/hello`
Connection established!
Connection established!
Connection established!
Connection established!
…

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

fn main() {
    let listner = TcpListener::bind("127.0.0.1:7878").unwrap();

    for stream in listner.incoming() {
        let stream = stream.unwrap();
        handle_connection(stream);
    }
}

fn handle_connection(mut stream: TcpStream) {
    let mut buffer = [0; 1024];

    stream.read(&mut buffer).unwrap();

    println!("Request: {}", String::from_utf8_lossy(&buffer[..]));
}

fn handle_connection(mut stream: TcpStream) {
    let mut buffer = [0; 1024];
    stream.read(&mut buffer).unwrap();

    let mut file = File::open("hello.html").unwrap();

    let mut contents = String::new();
    file.read_to_string(&mut contents).unwrap();

    let response = format!("HTTP/1.1 200 OK\r\n\r\n", contents);
    stream.write(response.as_bytes()).unwrap();
    stream.flush().unwrap();
}

fn handle_connection(mut stream: TcpStream) {
    let mut buffer = [0; 1024];
    stream.read(&mut buffer).unwrap();

    let mut file = File::open("hello.html").unwrap();

    let mut contents = String::new();
    file.read_to_string(&mut contents).unwrap();

    let response = format!("HTTP/1.1 200 OK\r\n\r\n{}", contents);
    stream.write(response.as_bytes()).unwrap();
    stream.flush().unwrap();
}

これで、curl http://127.0.0.1:7878を打つと、htmlが返ってくる

fn handle_connection(mut stream: TcpStream) {
    let mut buffer = [0; 1024];
    stream.read(&mut buffer).unwrap();

    let get = b"GET / HTTP/1.1\r\n"; 

    if buffer.starts_with(get) {
        let mut file = File::open("hello.html").unwrap();
        let mut contents = String::new();
        file.read_to_string(&mut contents).unwrap();

        let response = format!("HTTP/1.1 200 OK\r\n\r\n{}", contents);
        stream.write(response.as_bytes()).unwrap();
        stream.flush().unwrap();
    } else {
        let status_line = "HTTP/1.1 404 NOT FOUND\r\n\r\n";
        let mut file = File::open("404.html").unwrap();
        let mut contents = String::new();

        file.read_to_string(&mut contents).unwrap();

        let response = format!("{} {}", status_line, contents);

        stream.write(response.as_bytes()).unwrap();
        stream.flush().unwrap();
    }    
}