Node.js HTTP API 是非常低层的。是开启搭建服务的基础模块，本次搭建使用log4js来记录打印信息

get

默认的get请求，简单实现方式

  1. const http = require('http')
  3. const https = require('https')
  5. const logger = require('../../utils/log')
  7. const queryString = require('querystring')
  9. const server = http.createServer((request, response) => {
  10.     // logger.debug(res)
  11.     // logger.debug(res)
  12.     // const url = request.url
  13.     // logger.debug(url)
  14.     // response.writeHead(200, {
  15.     //     'content-type': 'application/json;charset-utf-8'
  16.     // })
  17.     // response.write(`{'url':${url}}`)
  18.     // response.end('{"x":200}')
  19.     // let data = ''
  20.     // request.on('data', (chunk) => {
  21.     //     data += chunk
  22.     // })
  23.     // request.on('end', () => {
  24.     //     response.writeHead(200, {
  25.     //         'content-type': 'application/json;charset-utf-8'
  26.     //     })
  27.     //     logger.debug(JSON.stringify(queryString.parse(data)))
  28.     //     response.end()
  29.     // })
  30.     https.get('https://www.xiaomiyoupin.com/mtop/market/cat/list', (result) => {
  31.         let data = ''
  32.         result.on('data', (chunk) => {
  33.             data += chunk
  34.         })
  35.         result.on('end', () => {
  36.             response.writeHead(200, {
  37.                 'content-type': 'application/json;charset-utf-8'
  38.             })
  39.             response.write(data)
  40.             response.end()
  41.         })
  42.     })
  44.     // https.get('https://www.xiaomiyoupin.com/mtop/market/cat/list', (result) => {
  45.     //     let data = ''
  46.     //     result.on('data', (chunk) => {
  47.     //         data += chunk
  48.     //     })
  49.     //     result.on('end', () => {
  50.     //         response.writeHead(200, {
  51.     //             'content-type': 'application/json;charset-utf-8'
  53.     //         })
  54.     //         logger.debug(data)
  55.     //         response.end()
  56.     //     })
  57.     // })
  58. })
  60. server.listen(2139, () => {
  61.     console.log('localhost:2139')
  62. })

post

此处列举了一个简单的定时发送post请求例子（）

  1. const http = require('http')
  2. const querystring = require('querystring')
  4. const postData = querystring.stringify({
  5.     province: '上海',
  6.     city: '上海',
  7.     district: '宝山区',
  8. })
  9. const options = {
  10.     protocol: 'http:',
  11.     hostname: 'localhost',
  12.     method: 'post',
  13.     port: 3000,
  14.     path: '/data',
  15.     headers: {
  16.         'Content-Type': 'application/x-www-form-urlencoded',
  17.         'Content-Length': Buffer.byteLength(postData)
  18.     }
  19. }
  20. const server = http.createServer((req, res) => {
  21.     const request = http.request(options, (result) => {
  23.     })
  24.     request.write(postData)
  25.     request.end()
  26.     res.end()
  27. })
  28. // function doPost() {
  29. //     let data
  30. //     let req = https.request(options, (res) => {
  31. //       res.on('data', chunk => data += chunk)
  32. //       res.on('end', () => {
  33. //         console.log(data)
  34. //       })
  35. //     })
  36. //     req.write(postData)
  37. //     req.end()
  38. //   }
  39. // setInterval(() => {
  40. //   doPost()
  41. // }, 1000)
  42. server.listen('2139', () => {
  43.     console.log('localhost:2139')
  44. })

jsonp

由于浏览器有同源策略限制，采用解决跨域方案jsonp，JavaScript请求没有限制，利用请求回来的代码，直接执行，实现跨域请求
server.js

  1. const http = require('http')
  3. const server = http.createServer((req, res) => {
  4.     let url = req.url
  5.     switch (url) {
  6.         case '/api/data':
  7.             res.write('alert(0111)')
  8.             break;
  9.         default:
  10.             res.write('page not found')
  11.     }
  12.     res.end()
  13. })
  15. server.listen('2139', () => {
  16.     console.log('localhost:2139')
  17. })

index.html

  1. <!DOCTYPE html>
  2. <html lang="en">
  3.   <head>
  4.     <meta charset="UTF-8" />
  5.     <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  6.     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  7.     <title>jsonp</title>
  8.   </head>
  9.   <body>
  10.     <script>
  11.       function getData(data) {
  12.         console.log(data);
  13.       }
  14.     </script>
  15.     <script scr="http://localhost:2139/api/data"></script>
  16.     <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.js"></script>
  17.   </body>
  18. </html>

cors

在response的header里面返回’Access-Control-Allow-Origin’: ‘*’，设置为响应所以请求，解决跨域

  1. const server = http.createServer((req, res) => {
  2.     let url = req.url
  3.     res.writeHead(200, {
  4.         'content-type': 'application/json;charset=utf-8',
  5.         'Access-Control-Allow-Origin': '*'
  6.     })
  7.     res.write(url)
  8.     res.end()
  9. })

proxy
利用中间件proxy，代理请求

  1. const http = require('http')
  2. const { createProxyMiddleware } = require('http-proxy-middleware')
  4. // console.log(createProxyMiddleware)
  5. const server = http.createServer((req, res) => {
  6.     let url = req.url
  7.     if (/\/ajax/.test(url)) {
  8.         const proxy = createProxyMiddleware('/ajax', {
  9.             target: 'https://lady.vip.com',
  10.             changeOrigin: true
  11.         })
  12.         // https://lady.vip.com/ajax/getBrandRank.php?part=selling&warehouse=VIP_BJ&areaCode=101101&pagecode=a&brandInfoExt%5Bfields%5D=activeIndexTips,displayEndtime,salesNo,brandImage,mobileImageOne,agio,salesName,brandStoreSn,vendorSaleMessage,isSpecialBanner,hiddenEndTime,iconInfo,link&brandInfoExt%5BstartIndex%5D=0&brandInfoExt%5Bnum%5D=36&preview=0&sell_time_from&time_from&_=1606891993105
  14.         proxy(req, res)
  15.     } else if (/\/api/.test(url)) {
  16.         const proxy2 = createProxyMiddleware('/api', {
  17.             target: 'https://m.lagou.com',
  18.             changeOrigin: true,
  19.             pathRewrite: {
  20.                 '^/api': ''
  21.             }
  22.         })
  23.         proxy2(req, res)
  24.     }
  25.     // res.end()
  26. })
  28. server.listen(2139, () => {
  29.     console.log('2139succ')
  30. })