old_contents: import dj_database_url
  
  from .common import *  # noqa
  
  DATABASES = {
      'default': dj_database_url.config(conn_max_age=500),
  }
  
  DEBUG = False
  
  ALLOWED_HOSTS = ['.herokuapp.com']
  
new_contents: import dj_database_url
  
  from .common import *  # noqa
  
  DATABASES = {
      'default': dj_database_url.config(conn_max_age=500),
  }
  
  DEBUG = False
  
  ALLOWED_HOSTS = ['*']
  
subject: Allow all hosts when on Heroku