private boolean hostMatch(String reference, String host) {
        if ("".equals(reference)) {
            return true;
        } else {
            // XXX case-sensitivity
            return reference.equalsIgnoreCase(host);
        }
    }
@see jakarta.servlet.http.HttpServlet#doGet(jakarta.servlet.http.HttpServletRequest, jakarta.servlet.http.HttpServletResponse)
src/nu/validator/servlet/VerifierServlet.java