Return a (target, url_agrs) tuple or raise HTTPError(404/405).

def match(self, environ):
        ''' Return a (target, url_agrs) tuple or raise HTTPError(404/405). '''
        targets, urlargs = self._match_path(environ)
        if not targets:
            raise HTTPError(404, "Not found: " + repr(environ['PATH_INFO']))
        method = environ['REQUEST_METHOD'].upper()
        if method in targets:
            return targets[method], urlargs
        if method == 'HEAD' and 'GET' in targets:
            return targets['GET'], urlargs
        if 'ANY' in targets:
            return targets['ANY'], urlargs
        allowed = [verb for verb in targets if verb != 'ANY']
        if 'GET' in allowed and 'HEAD' not in allowed:
            allowed.append('HEAD')
        raise HTTPError(405, "Method not allowed.",
                        header=[('Allow',",".join(allowed))])