String key = url.getProtocol() + ": Server server = (Server) servers.get(key);
Server server = (Server) servers.get(getKey(url));
    protected Server getServer(URL url) {        String key = url.getProtocol() + "://" + url.getHost() + ":" + url.getPort();        Server server = (Server) servers.get(key);        return server;    }