public function __construct($api_key, $secret, $backend_api_key, $backend_secret_key, $backend_host, $backend_port, $backend_url, $canvas_url, $local_req_uri, $session_key = null)
{
parent::__construct($api_key, $secret, $session_key);
$this->m_backend_api_key = $backend_api_key;
$this->m_backend_secret_key = $backend_secret_key;
$this->m_an = Analytics_Utils::instance($backend_api_key, $backend_secret_key, $backend_host, $backend_port, $backend_url, $canvas_url, $local_req_uri);
//$this->m_an->set_ab_testing_mgr(new AB_Testing_Manager($backend_api_key, $backend_secret_key,
//$ab_testing_host, $ab_testing_port ));
}