@Override
    public String getIpAddrFromServer(DiscoveryResult discoveryResult) {
        Optional<String> ipAddr = discoveryResult.getIPAddr();
        return ipAddr.isPresent() ? ipAddr.get() : null;
    }
Netty Origin basic implementation that can be used for most apps, with the more complex methods having no-op
implementations.

Author: Arthur Gonigberg
Date: December 01, 2017
zuul-core/src/main/java/com/netflix/zuul/origins/BasicNettyOrigin.java