public function listen($url)
{
// Make sure url starts with expected url
if (strpos($url, $this->base_url) !== 0) {
return '';
}
// extract action argument
$url = substr($url, strlen($this->base_url));
$url = parse_url($url, PHP_URL_PATH);
$pieces = explode('/', $url);
if (empty($pieces[0])) {
return '';
}
return $pieces[0];
}