private Builder domain(String domain, boolean hostOnly) {
            this.domain = domain;
            this.hostOnly = hostOnly;
            return this;
        }
Set the host-only domain for this cookie. The cookie will match {@code domain} but none
of its subdomains.

@param domain The host-only domain pattern.
@return The same builder.
netbare-injector/src/main/java/com/github/megatronking/netbare/http/Cookie.java