*
     * 1) IP Address - If a dot-quad IP string is used with getByName (or used
     * to create an NbtAddress internal to this netbios package), no query is
     * sent on the wire and the only state this object has is it's IP address
     * (but that's enough to connect to a host using *SMBSERVER for CallingName).
     *
     * 2) IP Address, NetBIOS name, nodeType, groupName - If however a

   * such as "::c000:201".
   *
   * @param ip {@link InetAddress} to be converted to an address string
   * @return {@code String} containing the text-formatted IP address
   * @since 10.0
   */
  public static String toAddrString(InetAddress ip) {
    checkNotNull(ip);
    if (ip instanceof Inet4Address) {
      // For IPv4, Java's formatting is good enough.

        String username = "testuser";
        String ip = "192.168.1.2";

        // First attempts should be allowed
        assertTrue(rateLimiter.checkAttempt(username, ip));
        rateLimiter.recordFailure(username, ip);

        assertTrue(rateLimiter.checkAttempt(username, ip));
        rateLimiter.recordFailure(username, ip);

        assertTrue(rateLimiter.checkAttempt(username, ip));
        rateLimiter.recordFailure(username, ip);

    }

    /**
     * Manually unblock an IP
     *
     * @param sourceIp the IP to unblock
     * @return true if IP was unblocked, false if not found
     */
    public boolean unblockIp(String sourceIp) {
        IpAttempts ip = ipAttempts.get(sourceIp);
        if (ip != null) {
            ip.reset();
            log.info("Manually unblocked IP: {}", sourceIp);
            return true;
        }

      InetAddress ip = InetAddresses.forString(validIsatapAddress);
      assertTrue(InetAddresses.isIsatapAddress((Inet6Address) ip));
      assertWithMessage("checking '%s'", validIsatapAddress)
          .that(InetAddresses.getIsatapIPv4Address((Inet6Address) ip))
          .isEqualTo(ipv4);
    }
    for (String nonIsatapAddress : nonIsatapAddresses) {
      InetAddress ip = InetAddresses.forString(nonIsatapAddress);

     *
     * 1) IP Address - If a dot-quad IP string is used with getByName (or used
     * to create an NbtAddress internal to this netbios package), no query is
     * sent on the wire and the only state this object has is it's IP address
     * (but that's enough to connect to a host using *SMBSERVER for CallingName).
     *
     * 2) IP Address, NetBIOS name, nodeType, groupName - If however a

In the DNS server(s) you would configure a record (an "`A record`") to point **your domain** to the public **IP address of your server**.

You would probably do this just once, the first time, when setting everything up.

/// tip

This Domain Name part is way before HTTPS, but as everything depends on the domain and the IP address, it's worth mentioning it here.

///

	addrs, err := net.InterfaceAddrs()
	if err != nil {
		t.Fatalf("%s.  Unable to get IP addresses of this host.", err)
	}

	for _, addr := range addrs {
		var ip net.IP
		switch v := addr.(type) {
		case *net.IPNet:
			ip = v.IP
		case *net.IPAddr:
			ip = v.IP
		}

		if ip.To4() != nil {
			localIP4.Add(ip.String())
		}
	}

	// Filter ipList by IPs those do not start with '127.'.

你可能會租一台雲端伺服器（虛擬機）或類似的服務，並擁有一個<dfn title="不會隨時間改變；非動態的">固定</dfn>的**公用 IP 位址**。

在 DNS 伺服器中，你會設定一個紀錄（「`A record`」）指向**你的網域**所對應的**伺服器公用 IP 位址**。

這通常在初次建置時設定一次即可。

/// tip

「網域名稱」是發生在 HTTPS 之前的事情，但一切都依賴網域與 IP 位址，因此在此一併說明。

///

### DNS { #dns }

現在聚焦在實際的 HTTPS 部分。

首先，瀏覽器會向 **DNS 伺服器**查詢該**網域的 IP**，例如 `someapp.example.com`。

DNS 伺服器會回覆要使用的**IP 位址**，那就是你在 DNS 伺服器中設定的、伺服器對外的公用 IP 位址。

DNSサーバーでは、**取得したドメイン**をあなたのサーバーのパブリック**IPアドレス**に向けるレコード（「`A record`」）を設定します。

これはおそらく、最初の1回だけあり、すべてをセットアップするときに行うでしょう。

/// tip | 豆知識

ドメイン名の話はHTTPSに関する話のはるか前にありますが、すべてがドメインとIPアドレスに依存するため、ここで言及する価値があります。

///

### DNS { #dns }

では、実際のHTTPSの部分に注目してみましょう。

まず、ブラウザは**DNSサーバー**に**ドメインに対するIP**が何であるかを確認します。今回は、`someapp.example.com`とします。