public static PublicSuffix get() {
        return PublicSuffixHolder.INSTANCE;
    }
Utility class to determine if a domain is a public suffix. List of rules taken from
<a href="https://publicsuffix.org/list/public_suffix_list.dat">Public Suffix List</a>.
core/src/main/java/com/linecorp/armeria/internal/client/PublicSuffix.java