php - return meta redirect in ajax response

I want to return a meta redirect tag in my Ajax response. How can this be done ?

I have a Zend Controller where in my init function I check for the session expiration. If the session already expired and the request was ajax I want to return a meta redirect tag to my log in controller.

If there is a better was please let me know.

public function init()
{
    if ($sessionExpired)
    {
        if($this->_request->isXmlHttpRequest()){               
            $this->getResponse()->setBody('<meta http-equiv="refresh" content="1;url='.APP_URL.'/authentication/loginform'.'">');                        
    }
}
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