new_contents: # -*- coding: utf-8 -*-
  import asyncio
  import os
  
  from flask import Flask
  
  flask_app = Flask(__name__)
  
  
  @flask_app.route('/')
  def hello():
      return 'Hello World!'
  
  
  async def main():
      port = int(os.environ.get('PORT', 5000))
      future_tasks = [
          asyncio.ensure_future(flask_app.run(host='0.0.0.0', port=port)),
      ]
  
      return await asyncio.gather(*future_tasks)
  
  
  if __name__ == '__main__':
      print('Application server gets started!')
      event_loop = asyncio.get_event_loop()
      event_loop.run_until_complete(main())
  
subject: Add web example