This is the 7th day of my participation in Gwen Challenge

Create a new folder NPM init-y

Creating an HTTP Service

const http= require('http')
const server = http.createServer((req,res) = > {
  // Set the response header
  res.setHeader('Content-Type'.'application/json')
  // Return data
  res.end('
 Returns content 
')})// Listen on the port
server.listen(1996)
console.log('OK');
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Processing GET requests

const http= require('http')
const querystring = require('querystring')
const server = http.createServer((req,res) = > {
  res.setHeader('Content-Type'.'application/json')
  console.log('method', req.method)
  const url = req.url
  console.log('url', url);
  Parse queryString.parse converts a=1&b=2&c=3 to {a:1,b:2,c:3}
  req.query = querystring.parse(url.split('? ') [1])
  console.log('query', req.query);
  res.end(JSON.stringify(req.query))
})
server.listen(1996)
console.log('OK');
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Handling POST requests

const http = require('http')
const server = http.createServer((req,res) = > {
  // Use req.method to determine the request type
  if(req.method == 'POST') {
    console.log('req content-type: ', req.headers['content-type']);
    // Accept data
    let postData = ' '
    // Listen for req data and end events. When data time transfer is complete, reQ end events will be triggered
    req.on('data'.chunk= > {
      postData += chunk.toString()
    })
    req.on('end'.() = > {
      console.log('postData: ', postData);
      res.end('Hello World! ')
    })
  }
})
server.listen(1996)
console.log('OK');
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A comprehensive

const http = require('http')
const querystring = require('querystring')
const server = http.createServer((req, res) = > {
  const method = req.method
  const url = req.url
  const path = req.url.split('? ') [0]
  const query = querystring.parse(url.split('? ') [1])
  // Set the response header
  res.setHeader('Content-Type'.'application/json')
  // The data returned
  const resData = {
    method,
    url,
    path,
    query
  }
  // Handle GET and POST separately
  if(method == 'GET') {
    res.end(JSON.stringify(resData))
  }
  if(method == 'POST') {
    let postData = ' '
    req.on('data'.chunk= > {
      postData += chunk.toString()
    })
    req.on('end'.() = > {
      resData.postData = postData
      res.end(JSON.stringify(resData))
    })
  }
})
server.listen(1996)
console.log('OK')
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Officially open to

Setting up the development environment

• Initialize the NPM environment NPM init-y

• Add the bin folder in your home directory and create www.js, then modify package.json to change the entry file address

  {
    "name": "node-blog"."version": "1.0.0"."description": ""."main": "bin/www.js"."scripts": {
      "test": "echo \"Error: no test specified\" && exit 1"
    },
    "keywords": []."author": ""."license": "ISC"
  }
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• www.js and app. Js

  // www.js
  const http = require('http')
  
  const PORT = 1996
  
  const serverHandle = require('.. /app.js')
  
  const server = http.createServer(serverHandle)
  
  server.listen(PORT)
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  Create app.js, the same as the bin directory

  // app.js
  const serverHandle = (req, res) = > {
    res.setHeader('Content-Type'.'application/json')
    const resData = {
      name: 'Tmier'.site: 'xxx.com'
    }
    res.end(JSON.stringify(resData))
  }
  module.exports = serverHandle
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• Installing a plug-in

  npm i nodemon cross-env --save-dev
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  After a successful installation, add a new command to package.json

    "scripts": {...// Set the environment variable to dev and start www.js using nodemon
      "dev": "cross-env NODE_ENV=dev nodemon ./bin/www.js"
    }
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  It can then be run using:

  npm run dev
  // Nodemon can listen for changes in js files and update them automatically
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  The development environment is set up and the routing will start tomorrow

  Because it is really just beginning to learn Node, so notes slightly immature, step by step, come on ~