old_contents: let webpack = require('webpack');
  let WebpackDevServer = require('webpack-dev-server');
  let config = require('./webpack.config');
  
  new WebpackDevServer(webpack(config), {
    publicPath: config.output.publicPath,
    hot: true,
    inline: true
  }).listen(3000, '0.0.0.0', (err, result) => {
    if (err) {
      console.log(err);
    }
  
    console.log('Listening at 0.0.0.0:3000');
  })
new_contents: let webpack = require('webpack');
  let WebpackDevServer = require('webpack-dev-server');
  let config = require('./webpack.config');
  //ajax code
  new WebpackDevServer(webpack(config), {
    publicPath: config.output.publicPath,
    hot: true,
    inline: true
  }).listen(3000, '0.0.0.0', (err, result) => {
    if (err) {
      console.log(err);
    }
  
    console.log('Listening at 0.0.0.0:3000');
  })
  
subject: comment named ajax added