CAllUser::RequiredHTTPAuthBasic

public function RequiredHTTPAuthBasic($Realm = "Bitrix")
{
	header("WWW-Authenticate: Basic realm="{$Realm}"");
	if (stristr(php_sapi_name(), "cgi") !== false)
	{
		header("Status: 401 Unauthorized");
	}
	else
	{
		header($_SERVER["SERVER_PROTOCOL"] . " 401 Unauthorized");
	}

	return false;
}