public static ProxiedAddresses of(InetSocketAddress sourceAddress) {
        return new ProxiedAddresses(sourceAddress, ImmutableList.of());
    }
Creates a new instance with the specified {@code sourceAddress}.
Note that {@linkplain InetSocketAddress#getPort() port} {@code 0} means that the port number is unknown.
core/src/main/java/com/linecorp/armeria/server/ProxiedAddresses.java