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)) : '');
}