Go 和 Rust 经常被拿来做比较，之前写过一篇文章分别使用go 和rust 编写tcp server，感兴趣的可以翻看历史，今天我们再撸一篇 http server的文章，废话不多说。

Go HTTP Server

我们先展示一个Go 编写HTTP server。

package main

import (
	"fmt"
	"io"
	"log"
	"net/http"
)

type handler struct{}

func (theHandler *handler) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
	log.Printf("Received request: %s
", request.URL)
	log.Printf("%v
", request)
	io.WriteString(writer, "Hello world!")
}

const port = "8080"

func main() {
	server := http.Server{
		Addr:    fmt.Sprintf(":%s", port),
		Handler: &handler{},
	}

	server.ListenAndServe()
}

go代码已经简单到不能再简单了，没啥好说的。创建一个http server，注册handler，最后启动监听，代码非常简洁高效。

Rust HTTP Server

rust 原生没有http server 的支持，不过你可以使用warp 或者hyper 之类的三方package，不过这里面还是使用原生rust 的能力编写一个。

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

//获取请求
fn handle_read(mut stream: &TcpStream) {
    let mut buf = [0u8; 4096];
    match stream.read(&mut buf) {
        Ok(_) => {
            let req_str = String::from_utf8_lossy(&buf);
            println!("{}", req_str);
            },
        Err(e) => println!("Unable to read stream: {}", e),
    }
}

// 返回response
fn handle_write(mut stream: TcpStream) {
    let response = b"HTTP/1.1 200 OKr
Content-Type: text/html; charset=UTF-8r
r
Hello worldr
";
    match stream.write(response) {
        Ok(n) => println!("Response sent: {} bytes", n),
        Err(e) => println!("Failed sending response: {}", e),
    }
}

fn handle_client(stream: TcpStream) {
    handle_read(&stream);
    handle_write(stream);
}

fn main() {
    let port = "8080";
    let listener = TcpListener::bind(format!("127.0.0.1:{}", port)).unwrap();
    println!("Listening for connections on port {}", port);

    for stream in listener.incoming() {
        match stream {
            Ok(stream) => {
                thread::spawn(|| {
                    handle_client(stream) //处理请求
                });
            }
            Err(e) => {
                println!("Unable to connect: {}", e);
            }
        }
    }
}

我们通过建立tcp server 然后解析请求，并返回HTTP response。虽然代码看着长点，但也不复杂。