public function post($url, $params=array(), $token='', $secret='') {
        return $this->request('POST', $url, $params, $token, $secret);
    }
public function post($url, $params=array(), $token='', $secret='') {
        return $this->request('POST', $url, $params, $token, $secret);
    }
public function post ( $ url , $ params = array ( ) , $ token = '' , $ secret = '' ) { return $ this -> request ( 'POST' , $ url , $ params , $ token , $ secret ) ; }
shortcut to start http post request
shortcut to start http post request