private fun decodeIpv6(input: String): ByteArray? = decodeIpv6(input, 0, input.length)

  @Test
  fun testToCanonicalHost() {
    // IPv4
    assertThat("127.0.0.1".toCanonicalHost()).isEqualTo("127.0.0.1")
    assertThat("1.2.3.4".toCanonicalHost()).isEqualTo("1.2.3.4")

    // IPv6
    assertThat("::1".toCanonicalHost()).isEqualTo("::1")
    assertThat("2001:db8::1".toCanonicalHost()).isEqualTo("2001:db8::1")

	printCLIAccessMsg(strippedAPIEndpoints[0], "myminio")

	// Prints documentation message.
	printObjectAPIMsg()
	if globalIsDistErasure {
		logger.Startup(color.Bold(banner))
	}
}

// Returns true if input is IPv6
func isIPv6(host string) bool {
	h, _, err := net.SplitHostPort(host)
	if err != nil {
		h = host
	}
	ip := net.ParseIP(h)
	return ip.To16() != nil && ip.To4() == nil
}

 * Prefer to alternate IP addresses from different address families, (IPv6 / IPv4), starting with IPv6.
 * Don't start a new attempt until 250 ms after the most recent attempt was started.
 * Keep whichever TCP connection succeeds first and cancel all the others.

 * [system DNS service][SYSTEM], which is the default. Some applications may provide their own
 * implementation to use a different DNS server, to prefer IPv6 addresses, to prefer IPv4 addresses,
 * or to force a specific known IP address.
 *
 * Implementations of this interface must be safe for concurrent use.
 */
fun interface Dns {
  /**

  // All addresses in this slice must be the same type. This field is
  // immutable after creation. The following address types are currently
  // supported:
  // * IPv4: Represents an IPv4 Address.
  // * IPv6: Represents an IPv6 Address.
  // * FQDN: Represents a Fully Qualified Domain Name.
  optional string addressType = 4;

  // endpoints is a list of unique endpoints in this slice. Each slice may

	CNIAgentRunDir           = "cni-agent-run-dir"
	ExcludeNamespaces        = "exclude-namespaces"
	AmbientEnabled           = "ambient-enabled"
	AmbientDNSCapture        = "ambient-dns-capture"
	AmbientIPv6              = "ambient-ipv6"
	AmbientTPROXYRedirection = "ambient-tproxy-redirection"

	// Repair
	RepairEnabled            = "repair-enabled"
	RepairDeletePods         = "repair-delete-pods"
	RepairRepairPods         = "repair-repair-pods"

			domains:  []string{"example.com", "example.com:8080"},
			expected: "example.com",
		},
		{
			desc:     "test domains with ipv4 addresses",
			domains:  []string{"example.com", "example.com:8080", "1.2.3.4", "1.2.3.4:8080"},
			expected: "example.com, 1.2.3.4",
		},
		{
			desc:     "test domains with ipv6 addresses",
			domains:  []string{"example.com", "example.com:8080", "[fd00:10:96::7fc7]", "[fd00:10:96::7fc7]:8080"},

_2022-02-01_

**This release introduces fast fallback to better support mixed IPv4+IPv6 networks.** Fast fallback
is what we're calling our implementation of Happy Eyeballs, [RFC 8305][rfc_8305]. With this
feature OkHttp will attempt both IPv6 and IPv4 connections concurrently, keeping whichever connects
first. Fast fallback gives IPv6 connections a 250 ms head start so IPv6 is preferred on networks
where it's available.

	// APIPA/"link-local" IP.
	//
	// It doesn't matter what this IP is, so long as it's not routable and doesn't collide with anything else.
	//
	// IPv6 link local ranges are designed to be collision-resistant by default, and so probably never need to be overridden
	DefaultHostProbeSNATIP   = "169.254.7.127"
	DefaultHostProbeSNATIPV6 = "fd16:9254:7127:1337:ffff:ffff:ffff:ffff"
)

		// addresses (for=8.8.8.8, 8.8.4.4, 172.16.1.20 is valid) we only
		// extract the first, which should be the client IP.
		if match := forRegex.FindStringSubmatch(fwd); len(match) > 1 {
			// IPv6 addresses in Forwarded headers are quoted-strings. We strip
			// these quotes.
			addr = strings.Trim(match[1], `"`)
		}
	}

	return addr
}

// GetSourceIPRaw retrieves the IP from the request headers