如何使用NodeJs创建HTTP服务？

const http = require('http')
http.createServer(function (req, res) {
    res.writeHead(200, {
        'Content-Type': 'text/plain'
    })
    res.end('Hello World')
}).listen(80, '127.0.0.1')
 
console.log('Server running at http://127.0.0.1:80/')

// 三次握手
* Rebuilt URL to: http://127.0.0.1:80/
*   Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to 127.0.0.1 (127.0.0.1) port 80 (#0)

// 客户端向服务端发送请求报文
> GET / HTTP/1.1
> Host: 127.0.0.1:80
> User-Agent: curl/7.54.0
> Accept: */*
>

// 服务端响应客户端内容
< HTTP/1.1 200 OK
< Content-Type: text/plain
< Date: Wed, 04 Aug 2021 15:55:55 GMT
< Connection: keep-alive
< Keep-Alive: timeout=5
< Transfer-Encoding: chunked
<
* Connection #0 to host 127.0.0.1 left intact
Hello World%

const http = require('http')
 
const options = {
    hostname: '127.0.0.1',
    port: 80,
    path: '/',
    method: 'GET'
}
const req = http.request(options, (res) => {
    console.log(`Status=${res.statusCode}, Headers=${JSON.stringify(res.headers)}`);
    res.setEncoding('utf8')
    res.on('data', (data) => {
        console.log(data)
    })
})
req.end()