Using codeigniter in QUERY_STRING mode with php fast CGI

The $this->input->get('data') change nothing, is still empty.

I use this controler :

PHP Code:

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Site extends CI_Controller {

    public function test() {

        echo '<pre>';
        print_r($_GET);
        echo '</pre>';

        echo $this->input->get('data');
    }


} 


This config :

PHP Code:

$config['uri_protocol'] = 'QUERY_STRING';
$config['allow_get_array'] = TRUE;
$config['enable_query_strings'] = FALSE; 


And this htaccess :

Code:

Options +FollowSymlinks
RewriteEngine on
RewriteBase /

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?/$1 [L]

My website is on php fastcgi hosting.

$_GET[] and $this->input->get('data') are still empty when I am trying this url : http://site.com/site/test?data=mydata

Thank you.