@UnstableApi
    public Predicate<InetSocketAddress> ipAddressFilter() {
        //noinspection unchecked
        return (Predicate<InetSocketAddress>) get(IP_ADDRESS_FILTER);
    }
Returns the {@link Predicate} which validates the IP address of a remote server.
core/src/main/java/com/linecorp/armeria/client/ClientFactoryOptions.java