http模块

const http = require('http');

let server = http.createServer((req, res)=>{
    res.end('hello, world!');
});

server.listen(3000, '127.0.0.1', ()=>{
    console.log('服务器已经启动!');
    // 5秒后关闭服务器
    setTimeout(()=>{
        // server.close();
    }, 5000);
});

// 监听服务器的关闭
server.on('close', ()=>{
    console.log('服务器已经关闭!');
});

// 监听服务器发生错误
server.on('error', (e)=>{
    if(e.code === 'EADDRINUSE'){
        console.log('端口号被调用!');
    }else {
        console.log('其它的错误', e.code);
    }
});

// 设置超时时间
server.setTimeout(1000, ()=>{
    console.log('设置超时时间为1s');
});

server.on('timeout', ()=>{
    // 超时要做什么操作
    console.log('连接已经超时');
});

let http = require('http');
let fs = require('fs');
let path = require('path');

http.createServer((req, res)=>{
    console.log(path.join(__dirname, 'request.log'));
    console.log(req);
    // 输出request.log文件
    let out = fs.createWriteStream(path.join(__dirname, 'request.log'));
    out.write('1) method:' + req.method + '
');
    out.write('2) url:' + req.url + '
');
    out.write('3) headers:' + JSON.stringify(req.headers) + '
');
    out.write('4) httpVersion:' + req.httpVersion + '
');
}).listen(8080, '127.0.0.1');

1) method:GET
2) url:/
3) headers:{"host":"localhost:8080","connection":"keep-alive","cache-control":"max-age=0",
　　　　"upgrade-insecure-requests":"1","user-agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) 
　　　　Chrome/75.0.3770.100 Safari/537.36","accept":"text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;
　　　　q=0.8,application/signed-exchange;v=b3","accept-encoding":"gzip, deflate, br","accept-language":"zh-CN,zh;q=0.9,en;q=0.8,lb;
　　　　q=0.7","cookie":"_nano_fp=XpdYn5CjX0UJnpTJXC_ALVUQMlgQwrkHd5Az6sJb"}
4) httpVersion:1.1

// 方式1

const url = require('url');
// 把字符串转成URL对象
const myURL = url.parse( 'https://user:pass@sub.itLike.com:8080/p/a/t/h?query=string#hash');
console.log(myURL);


const myURL = new URL('https://user:pass@sub.itLike.com:8080/p/a/t/h?query=string#hash');
console.log(myURL);

URL {
  href:
   'https://user:pass@sub.itlike.com:8080/p/a/t/h?query=string#hash',
  origin: 'https://sub.itlike.com:8080',
  protocol: 'https:',
  username: 'user',
  password: 'pass',
  host: 'sub.itlike.com:8080',
  hostname: 'sub.itlike.com',
  port: '8080',
  pathname: '/p/a/t/h',
  search: '?query=string',
  searchParams: URLSearchParams { 'query' => 'string' },
  hash: '#hash' 
}

const http = require('http');

http.createServer((req, res)=>{
     console.log(res.headersSent ? '响应头已经发送' : '响应头未发送');
     // 设置隐式响应头
     res.setHeader('Content-Type', 'text/html;charset=utf-8');
     res.writeHead(200, 'ok');
     res.write('<h1>Hello, ItLike</h1>');
     res.write('<h1>Hello, ItLike</h1>');
     res.write('<h1>Hello, ItLike</h1>');
     res.write('<h1>Hello, ItLike</h1>');
     // 本次响应结束
     res.end('<h1>撩课学院</h1>');
     console.log(res.headersSent ? '响应头已经发送' : '响应头未发送');
}).listen(3000, '127.0.0.1', ()=>{
    console.log('服务器已经启动~')
});