webpack.config.js

...
return {
  ...
  devServer: {
      host: '127.0.0.1',
      port: 8081,
      progress: true,
      inline: true,
      hot: false,
      proxy: [{
          context: [ '**', '!/ws/**' ],
          target: 'http://127.0.0.1:8080'
      }, {
          context: [ '/ws/**' ],
          target: 'ws://127.0.0.1:8080',
          ws: true
      }]
  },
  ...
}