upload file

Hi,

I want to upload image : here is my code :

exports.addMediaToAlbum = function(idAlbum, media, name, description, success, error){
 
    var client = Ti.Network.createHTTPClient();
    client.open('POST', 'https://server.com/api/photo/');
    client.setRequestHeader('Content-Type', 'multi-part/form-data');
 
    var id;
 
    client.onerror = function(e){
        error(e.error);
    };
 
    client.onload = function(e) {
        try{
            var response = this.responseText;
            //alert(response);
            success();
        }   
        catch(Err){
            error(Err);
        }
    };
 
    client.send({album: idAlbum, photo: media, name: name, description: description});
};

i try to send but it doesn't work. i have the same code width curl in php and it works :

$file = new File('/path/to/file.jpg');
        $fields = array(
            "photo" => "@".$file->getRealPath(),
            "name" => "superbe",
            "description" => "un super souvenir !",
            "album" => $album[0]['id']
        );
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $fields);
        $result = curl_exec($ch);

shoud l add information to my http request object ?

thanks..