private fun lookupHttps(hostname: String): List<InetAddress> {
    val networkRequests =
      buildList {
        add(client.newCall(buildRequest(hostname, DnsRecordCodec.TYPE_A)))

        if (includeIPv6) {
          add(client.newCall(buildRequest(hostname, DnsRecordCodec.TYPE_AAAA)))
        }
      }

    val failures = ArrayList<Exception>(2)
    val results = ArrayList<InetAddress>(5)