HTTP 各种特性应用（二）

一、Cookie

通过 Set-Cookie 设置、下次浏览器请求就会带上、键值对，可以设置多个。

Cookie 属性

max-age 和 expires 设置过期时间

Secure 只在 https 的时候发送

HttpOnly 无法通过 document.cookie 访问

server.js 代码

const http = require('http')
const fs = require('fs')

http.createServer(function (request, response) {
  console.log('request come', request.url)

  if (request.url === '/') {
    const html = fs.readFileSync('test.html', 'utf8')
    response.writeHead(200, {
      'Content-Type': 'text/html',
      'Set-Cookie': ['id=123; max-age=2', 'abc=456;domain=test.com']
    })
    response.end(html)
  }

}).listen(8888)

console.log('server listening on 8888')

test.html 代码

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
</head>
<body>
  <div>Content</div>
</body>
<script>
  console.log(document.cookie)
</script>
</html>

请求结果：

二、 HTTP 长连接

server.js

const http = require('http')
const fs = require('fs')

http.createServer(function (request, response) {
  console.log('request come', request.url)

  const html = fs.readFileSync('test.html', 'utf8')
  const img = fs.readFileSync('test.jpg')
  if (request.url === '/') {
    response.writeHead(200, {
      'Content-Type': 'text/html',
    })
    response.end(html)
  } else {
    response.writeHead(200, {
      'Content-Type': 'image/jpg',
      'Connection': 'keep-alive' // or close
    })
    response.end(img)
  }

}).listen(8888)

console.log('server listening on 8888')

test.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
</head>
<body>
  <img src="/test1.jpg" alt="">
  <img src="/test2.jpg" alt="">
  <img src="/test3.jpg" alt="">
  <img src="/test4.jpg" alt="">
  <img src="/test5.jpg" alt="">
  <img src="/test6.jpg" alt="">
  <img src="/test7.jpg" alt="">
  <img src="/test11.jpg" alt="">
  <img src="/test12.jpg" alt="">
  <img src="/test13.jpg" alt="">
  <img src="/test14.jpg" alt="">
  <img src="/test15.jpg" alt="">
  <img src="/test16.jpg" alt="">
  <img src="/test17.jpg" alt="">
  <img src="/test111.jpg" alt="">
  <img src="/test112.jpg" alt="">
  <img src="/test113.jpg" alt="">
  <img src="/test114.jpg" alt="">
  <img src="/test115.jpg" alt="">
  <img src="/test116.jpg" alt="">
  <img src="/test117.jpg" alt="">
</body>
</html>

test.jpg

请求运行结果：