def default_builder(self, request, name, args, kwargs):
        """Returns a URI for a named :class:`Route`.

        :param request:
            The current :class:`Request` object.
        :param name:
            The route name.
        :param args:
            Tuple of positional arguments to build the URI. All positional
            variables defined in the route must be passed and must conform
            to the format set in the route. Extra arguments are ignored.
        :param kwargs:
            Dictionary of keyword arguments to build the URI. All variables
            not set in the route default values must be passed and must
            conform to the format set in the route. Extra keywords are
            appended as a query string.

            A few keywords have special meaning:

            - **_full**: If True, builds an absolute URI.
            - **_scheme**: URI scheme, e.g., `http` or `https`. If defined,
              an absolute URI is always returned.
            - **_netloc**: Network location, e.g., `www.google.com`. If
              defined, an absolute URI is always returned.
            - **_fragment**: If set, appends a fragment (or "anchor") to the
              generated URI.
        :returns:
            An absolute or relative URI.
        """
        route = self.build_routes.get(name)
        if route is None:
            raise KeyError('Route named %r is not defined.' % name)

        return route.build(request, args, kwargs)
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/webapp2-2.5.1/webapp2.py/Router.default_builder/original