routing.py 文件源码

def get_default_redirect(self, rule, method, values, query_args):
        """A helper that returns the URL to redirect to if it finds one.
        This is used for default redirecting only.

        :internal:
        """
        assert self.map.redirect_defaults
        for r in self.map._rules_by_endpoint[rule.endpoint]:
            # every rule that comes after this one, including ourself
            # has a lower priority for the defaults.  We order the ones
            # with the highest priority up for building.
            if r is rule:
                break
            if r.provides_defaults_for(rule) and \
               r.suitable_for(values, method):
                values.update(r.defaults)
                domain_part, path = r.build(values)
                return self.make_redirect_url(
                    path, query_args, domain_part=domain_part)