text: const express = require('express')
  const bodyParser = require('body-parser')
  const webpack = require('webpack')
  const webpackDevMiddleware = require('webpack-dev-middleware')
  const webpackHotMiddleware = require('webpack-hot-middleware')
  const WebpackConfig = require('./webpack.config')
  
  const app = express()
  const compiler = webpack(WebpackConfig)
  
  app.use(webpackDevMiddleware(compiler, {
    publicPath: '/__build__/',
    stats: {
      colors: true,
      chunks: false
    }
  }))
  
  app.use(webpackHotMiddleware(compiler))
  
  app.use(express.static(__dirname))
  
  app.use(bodyParser.json())
  app.use(bodyParser.urlencoded({
    extended: true
  }))
  
  const router = express.Router()
  
  registerSimpleRouter ()
  
  registerBaseRouter ()
  
  registerErrorRouter ()
  
  registerExtendRouter ()
  
  app.use(router)
  
  const port = process.env.PORT || 1995
  module.exports = app.listen(port, () => {
    console.log(`Server listening on http://localhost:${port}, Ctrl+C to stop`)
  })
  
  
  // func
  function registerSimpleRouter () {
    router.get('/simple/get', function(req, res) {
      res.json({
        msg: `hello world`
      })
    })
  }
  
  function registerBaseRouter () {
    router.get('/base/get', function(req, res) {
      res.json(req.query)
    })
  
    router.post('/base/post', function(req, res) {
      res.json(req.body)
    })
    
    router.post('/base/buffer', function(req, res) {
      let msg = []
      req.on('data', (chunk) => {
        if (chunk) {
          msg.push(chunk)
        }
      })
      req.on('end', () => {
        let buf = Buffer.concat(msg)
        res.json(buf.toJSON())
      })
    })
  }
  
  function registerErrorRouter () {
    router.get('/error/get', function(req, res) {
      if (Math.random() > 0.5) {
        res.json({
          msg: `hello world`
        })
      } else {
        res.status(500)
        res.end()
      }
    })
    
    router.get('/error/timeout', function(req, res) {
      setTimeout(() => {
        res.json({
          msg: `hello world`
        })
      }, 3000)
    })
  }
  
  function registerExtendRouter () {
    router.get('/extend/get', function(req, res) {
      res.json({
        msg: 'hello world!'
      })   
    })
  
    router.options('/extend/options', function(req, res) {
      res.end()
    })
  
    router.delete('/extend/delete', function(req, res) {
      res.end()
    })
  
    router.head('/extend/head', function(req, res) {
      res.end()
    })
  
    router.post('/extend/post', function(req, res) {
      res.json(req.body)
    })
  
    router.put('/extend/put', function(req, res) {
      res.json(req.body)
    })
  
    router.patch('/extend/patch', function(req, res) {
      res.json(req.body)
    })
  
    router.get('/extend/user', function(req, res) {
      res.json({
        code: 0,
        message: 'Ok',
        result: {
          name: 'Jack',
          age: 18
        }
      })
    })
  }
  