private InetSocketAddress localAddress() {
        int port = parent.getUri().getPort();
        if (port < 0)
            port  = 0;
        return new InetSocketAddress(parent.getUri().getHost(), port);
    }
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