public static boolean hasIpV6() {
        return HasIpV6.HAS_IPV6;
    }
Returns {@code true} if the system has at least one working IPv6 network interface and
the {@code java.net.preferIPv4Stack} system property is not enabled.

@see NetUtil#isIpV4StackPreferred()
core/src/main/java/com/linecorp/armeria/common/util/SystemInfo.java