private function get_cache_key($path, $method = 'GET', $params = array())
 {
     $canonized = $this->_api->CanonizePath($path);
     //			$exploded = explode('/', $canonized);
     //			return $method . '_' . array_pop($exploded) . '_' . md5($canonized . json_encode($params));
     return $method . ':' . $canonized . (!empty($params) ? '#' . md5(json_encode($params)) : '');
 }