Codeigniter 2.0 CSRF Problem

[eluser]Twisted1919[/eluser]

Code:

if(isset($_SERVER['HTTP_HOST']))
{
    $config['base_url'] = isset($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) == 'on' ? 'https' : 'http';
    $config['base_url'] .= '://'. $_SERVER['HTTP_HOST'];
    $config['base_url'] .= str_replace(basename($_SERVER['SCRIPT_NAME']), '', $_SERVER['SCRIPT_NAME']);
}
else
{
    $config['base_url'] = 'http://localhost/';
}