如何使用NodeJs创建HTTP服务？

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1const http = require('http')
2http.createServer(function (req, res) {
3    res.writeHead(200, {
4        'Content-Type': 'text/plain'
5    })
6    res.end('Hello World')
7}).listen(80, '127.0.0.1')
8
9console.log('Server running at http://127.0.0.1:80/')

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1// 三次握手
2* Rebuilt URL to: http://127.0.0.1:80/
3*   Trying 127.0.0.1...
4* TCP_NODELAY set
5* Connected to 127.0.0.1 (127.0.0.1) port 80 (#0)
6
7// 客户端向服务端发送请求报文
8> GET / HTTP/1.1
9> Host: 127.0.0.1:80
10> User-Agent: curl/7.54.0
11> Accept: */*
12>
13
14// 服务端响应客户端内容
15< HTTP/1.1 200 OK
16< Content-Type: text/plain
17< Date: Wed, 04 Aug 2021 15:55:55 GMT
18< Connection: keep-alive
19< Keep-Alive: timeout=5
20< Transfer-Encoding: chunked
21<
22* Connection #0 to host 127.0.0.1 left intact
23Hello World%

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1const http = require('http')
2
3const options = {
4    hostname: '127.0.0.1',
5    port: 80,
6    path: '/',
7    method: 'GET'
8}
9const req = http.request(options, (res) => {
10    console.log(`Status=${res.statusCode}, Headers=${JSON.stringify(res.headers)}`);
11    res.setEncoding('utf8')
12    res.on('data', (data) => {
13        console.log(data)
14    })
15})
16req.end()