webapp2.py 文件源码

def default_matcher(self, request):
        """Matches all routes against a request object.

        The first one that matches is returned.

        :param request:
            A :class:`Request` instance.
        :returns:
            A tuple ``(route, args, kwargs)`` if a route matched, or None.
        :raises:
            ``exc.HTTPNotFound`` if no route matched or
            ``exc.HTTPMethodNotAllowed`` if a route matched but the HTTP
            method was not allowed.
        """
        method_not_allowed = False
        for route in self.match_routes:
            try:
                match = route.match(request)
                if match:
                    return match
            except exc.HTTPMethodNotAllowed:
                method_not_allowed = True

        if method_not_allowed:
            raise exc.HTTPMethodNotAllowed()

        raise exc.HTTPNotFound()