old_contents: 
  
  import logging
  log = logging.getLogger(__name__)
  
  from .request import Request
  
  class App(object):
      '''
      Base Application class.
  
      Create an instance of this, passing configuration options, and use the resulting instance as your WSGI application callable.
  
          application = App(root_view=myview)
  
      You can also sub-class this to provide the root_view.
      '''
      def __init__(self, **opts):
          self.root_view = opts['root_view']
          self.opts = opts
  
      def __call__(self, environ, start_response):
          request = Request(self, environ)
  
          response = self.root_view(request)
  
          start_response(response.status, response.build_headers())
  
          return response
  
new_contents: 
  
  import logging
  log = logging.getLogger(__name__)
  
  from .request import Request
  
  class App(object):
      '''
      Base Application class.
  
      Create an instance of this, passing configuration options, and use the resulting instance as your WSGI application callable.
  
          application = App(root_view=myview)
  
      You can also sub-class this to provide the root_view.
      '''
      def __init__(self, **opts):
          for key, val in opts.items():
              setattr(self, key, val)
  
      def __call__(self, environ, start_response):
          request = Request(self, environ)
  
          response = self.root_view(request)
  
          start_response(response.status, response.build_headers())
  
          return response
  
subject: Update the app with all supplied config arguments