node 第八天使用前后端不分离的方式实现cookie登录验证

实现cookie登录, 第一次登录成功后, cookie由服务端设置并保存在客户端, 后续访问在cookie过期前 (过期时间由后端设置) 将不需要登录
cookie出现的背景是
HTTP是无连接的，无状态的, 半双工(http2.0以下), 所以需要一个媒介存在http中, 服务端可以操作, 客户端也可以操作
就出现了cookie
纯后端实现cookie登录验证功能
node 后端

const fs = require('fs');
const url = require('url');
const http = require('http');
const querystring = require('querystring');
const path = require('path');const server = http.createServer((req, res) => {let cookie = req.headers.cookie;cookie = cookie.replace(/\s/g, '');const cookieInfo = querystring.parse(cookie, ';');console.log(cookie, cookieInfo);res.writeHead(200, { 'content-type': 'text/html' });if (req.method.toUpperCase() === 'GET') {if (cookieInfo.token === 'abc') {fs.readFile('./content.html', (err, data) => {if (err) {throw err;}res.end(data, 'utf-8');});} else {fs.readFile('./login.html', (err, data) => {if (err) {throw err;}res.end(data, 'utf-8');});}} else {req.on('data', chunk => {let data = querystring.parse(chunk.toString('utf-8'));if (data.user === 'zhang' && data.pw === '123') {let date = new Date();date.setDate(date.getDate() + 1);let expires = date.toUTCString();res.writeHead(200, {'content-type': 'text/html','set-cookie': [`token=abc; Expires=${expires}; HttpOnly;`, 'koken2=123']});fs.readFile('./content.html', (err, data) => {if (err) {throw err;}res.end(data, 'utf-8');});} else {fs.readFile('./login.html', (err, data) => {if (err) {throw err;}res.end(data, 'utf-8');});}});}
});
server.listen(3006);

未登录则返回登录页面

<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8" /><meta name="viewport" content="width=device-width, initial-scale=1.0" /><title>登录页</title></head><body><h1>请登录:</h1><form action="http://127.0.0.1:3006/login" method="post" enctype="application/x-www-form-urlencoded"><input name="user" type="text" /><input name="pw" type="password" /><input type="submit" value="登录" /></form></body>
</html>

已登录或有cookie凭证则返回内容页

<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8" /><meta name="viewport" content="width=device-width, initial-scale=1.0" /><title>内容页</title></head><body><h1>欢迎您~</h1></body>
</html>