code: def routing_feature(app):
      
      # enable regex routes
      app.url_map.converters['regex'] = RegexConverter
  
      urls = app.name.rsplit('.', 1)[0] + '.urls.urls'
  
      # important issue ahead
      # see: https://github.com/projectshift/shift-boiler/issues/11
      try:
          urls = import_string(urls)
      except ImportError as e:
          err = 'Failed to import {}. If it exists, check that it does not '
          err += 'import something non-existent itself! '
          err += 'Try to manually import it to debug.'
          raise ImportError(err.format(urls))
  
      # add routes now
      for route in urls.keys():
          route_options = urls[route]
          route_options['rule'] = route
          app.add_url_rule(**route_options)
docs: Add routing feature
      Allows to define application routes un urls.py file and use lazy views.
      Additionally enables regular exceptions in route definitions