我如何解决POST asp与codeIgniter上的rest客户端

我丢失了请，我如何解决CodeIgniter使用以下问题REST-客户端库。

我尝试发送POST, webApp或webresource是基于(ASP.net)，所以想法是这样的:

getUser ()

function getUser($ID){
//set config of the URL 
$config = array('server' => 'http://www.example.com/app/webapp/);
//initialize
$this->rest->initialize($config);
//now here is my problem look at this Im lost, I try this but I dont understand:
$postData = '__VIEWSTATE=/DKEKCdmdaEKEKEcnaEKEqkencKJE&'.
            '__EVENTVALIDATE=/DWRRKCkadjeEWWrjrDSJEJeW&'.
            'buttonSearch=search&'.
            'textFieldUserID='.$ID.';
$this->rest->option(CURLOPT_POSTFIELDS, $postData);
$this->rest->post('query/user.apsx'); 
//When run this, I use debug but NO show ERROR, this only return content html of page     whitout query of user data.
$this->rest->debug();

注意:I用户库rest和curl在构造函数中命名。我使用这个请求GET和工作完美。但是我想用POST

$this->load->library('curl');
$this->load->library('rest');

图书馆:https://github.com/philsturgeon/codeigniter-restclient

谢谢。! !