old_contents: import project
  import os
  
  app = project.app
  app.debug = False
  
  app.run(port=os.getenv('PORT', 5000))
  
new_contents: import project
  import os
  
  app = project.app
  app.debug = False
  
  app.run(host='0.0.0.0', port=int(os.getenv('PORT', 5000))
  
subject: fix listen