old_contents: #! /usr/bin/env python
  """
  Aragog Router Decorator
  -----------------------
  
  Convert any function into a WSGI endpoint with a simple decorator.
  """
  
  from aragog.wsgi import get_url
  from aragog.routing.client_error import HTTP404
  
  
  class Router(object):
      """
      Router holds the mapping of routes to callables.
      """
  
      def __init__(self):
          """
          Instance level route mapping
          """
          self.mapping = {}
  
      def __call__(self, environ, start_response):
          """
          Get a WSGI request, and pass it on to the correct callable.
          """
          routing = self.mapping.get(get_url(environ), HTTP404())
          return routing(environ, start_response)
  
      def add_route(self, url, func):
          """
          Adds a route to the mapping
          """
          if url not in self.mapping:
              self.mapping[url] = func
          else:
              raise KeyError("Route already exists: {}".format(url))
  
      def route(self, uri):
          """
          Route a request to a function
  
          :param: uri
          :param_type: string
          """
          def app_wrapper(f):
              self.add_route(uri, f)
              return f
          return app_wrapper
  
new_contents: #! /usr/bin/env python
  """
  Aragog Router Decorator
  -----------------------
  
  Convert any function into a WSGI endpoint with a simple decorator.
  """
  
  from aragog.wsgi import get_url
  from aragog.routing.client_error import HTTP404
  
  
  class Router(object):
      """
      Router holds the mapping of routes to callables.
      """
  
      def __init__(self):
          """
          Instance level route mapping
          """
          self.mapping = {}
  
      def __call__(self, environ, start_response):
          """
          Get a WSGI request, and pass it on to the correct callable.
          """
          routing = self.mapping.get(get_url(environ), HTTP404)
          return routing(environ, start_response)
  
      def add_route(self, url, func):
          """
          Adds a route to the mapping
          """
          if url not in self.mapping:
              self.mapping[url] = func
          else:
              raise KeyError("Route already exists: {}".format(url))
  
      def route(self, uri):
          """
          Route a request to a function
  
          :param: uri
          :param_type: string
          """
          def app_wrapper(f):
              self.add_route(uri, f)
              return f
          return app_wrapper
  
subject: Fix call to HTTP404 now it is a function.