code: def get_view_function(app, url, method):
      
      # pylint: disable=too-many-return-statements
  
      adapter = app.create_url_adapter(request)
  
      try:
          match = adapter.match(url, method=method)
      except RequestRedirect as ex:
          # recursively match redirects
          return get_view_function(app, ex.new_url, method)
      except (MethodNotAllowed, NotFound):
          # no match
          return None
  
      try:
          return app.view_functions[match[0]]
      except KeyError:
          # no view is associated with the endpoint
          return None
docs: Match a url and return the view and arguments
      it will be called with, or None if there is no view.
      Creds: http://stackoverflow.com/a/38488506