new_contents: from wsgiref.simple_server import make_server
  
  def application(environ, start_reponse):
      for item in environ:
          print(environ[item])
      start_reponse('200 OK', [('Content_type', 'text/html')])
      return '<h1>Hello world!</h1>'
  
  def server_run():
      httpd = make_server('127.0.0.1', 9000, application)
      print('http start on 9000...')
      httpd.serve_forever()
  if __name__ == '__main__':
      server_run()
subject: add application.py