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[eluser]Pascal Kriete[/eluser]
Whoops, missed the authentication part. I don't change anything except for the response.

Basically, my auth lib would look like this:

Code:

// asnyc_request() is defined in a helper
if ( ! $this->CI->session->userdata('logged_in') )
{
    if (async_request())
    {
        $this->output->set_status_header('401');
        echo json_encode(array('redirect' => site_url('login'));
        exit;
    }
    redirect(site_url('login'));
}

The javascript checks the header and acts accordingly. In this case it will redirect to the url in the response.