public String getLocalAddr() {
        InetSocketAddress localAddress = localAddress();
        if (localAddress.getAddress() == null) return null;
        return localAddress.getAddress().getHostAddress();
    }
Returns the Internet Protocol (IP) address of the interface
 on which the request was received.
container-core/src/main/java/com/yahoo/jdisc/http/filter/DiscFilterRequest.java