companion object {
    /**
     * A DNS that uses [InetAddress.getAllByName] to ask the underlying operating system to
     * lookup IP addresses. Most custom [Dns] implementations should delegate to this instance.
     */
    @JvmField
    val SYSTEM: Dns = DnsSystem()

    private class DnsSystem : Dns {
      override fun lookup(hostname: String): List<InetAddress> {
        try {

    // with MD5 or 512-bit RSA; that's insecure!
    //
    // openssl req \
    //   -x509 \
    //   -md5 \
    //   -nodes \
    //   -days 1 \
    //   -newkey rsa:512 \
    //   -keyout privateKey.key \
    //   -out certificate.crt
    val certificatePem =
      """
      |-----BEGIN CERTIFICATE-----

    //      last modified: 105 days ago
    //             served:   5 days ago
    //   default lifetime: (105 - 5) / 10 = 10 days
    //            expires:  10 days from served date = 5 days from now
    server.enqueue(
      MockResponse.Builder()
        .addHeader("Last-Modified: " + formatDate(-105, TimeUnit.DAYS))
        .addHeader("Date: " + formatDate(-5, TimeUnit.DAYS))
        .body("A")
        .build(),

noticeable.news

// Now-DNS : https://now-dns.com
// Submitted by Steve Russell <steve@now-dns.com>
dnsking.ch
mypi.co
n4t.co
001www.com
ddnslive.com
myiphost.com
forumz.info
16-b.it
32-b.it
64-b.it
soundcast.me
tcp4.me
dnsup.net
hicam.net
now-dns.net
ownip.net
vpndns.net
dynserv.org
now-dns.org

damnserver.com dance daplie.me data database.museum date date.fukushima.jp date.hokkaido.jp dating datsun dattolocal.com dattolocal.net dattorelay.com dattoweb.com davvenjarga.no davvenjárga.no davvesiida.no day dazaifu.fukuoka.jp dc.us dclk dd-dns.de ddns.me ddns.net ddns5.com ddnsfree.com ddnsgeek.com ddnsking.com ddnslive.com ddnss.de ddnss.org ddr.museum dds de de.com de.cool de.eu.org de.gt de.ls de.md de.trendhosting.cloud de.us deal dealer deals deatnu.no debian.net deca.jp deci.jp decorativearts.museum...

1D5A5         ; mapped                 ; 0066          # 3.1  MATHEMATICAL SANS-SERIF CAPITAL F
1D5A6         ; mapped                 ; 0067          # 3.1  MATHEMATICAL SANS-SERIF CAPITAL G
1D5A7         ; mapped                 ; 0068          # 3.1  MATHEMATICAL SANS-SERIF CAPITAL H
1D5A8         ; mapped                 ; 0069          # 3.1  MATHEMATICAL SANS-SERIF CAPITAL I

        .maxAge(2, TimeUnit.DAYS)
        .build()
    assertThat(cacheControl.toString()).isEqualTo("max-age=172800")
    assertThat(cacheControl.toString()).isSameAs(cacheControl.toString())
  }

  @Test
  @Throws(Exception::class)
  fun timeDurationTruncatedToMaxValue() {
    val cacheControl =
      CacheControl.Builder()
        .maxAge(365 * 100, TimeUnit.DAYS) // Longer than Integer.MAX_VALUE seconds.

 * seconds:
 *
 * ```java
 * Request request = new Request.Builder()
 *     .cacheControl(new CacheControl.Builder()
 *         .maxStale(365, TimeUnit.DAYS)
 *         .build())
 *     .url("http://publicobject.com/helloworld.txt")
 *     .build();
 * ```
 *
 * The [CacheControl] class can configure request caching directives and parse response caching

    // x509_extensions=x509_extensions
    // [distinguished_name]
    // [req_extensions]
    // [x509_extensions]
    // subjectAltName=DNS:localhost.localdomain,DNS:localhost,IP:127.0.0.1
    //
    // $ openssl req -x509 -nodes -days 36500 -subj '/CN=localhost' -config ./cert.cnf \
    //     -newkey rsa:512 -out cert.pem
    val certificate =
      certificate(
        """