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")
    assertThat("::ffff:192.168.0.1".toCanonicalHost()).isEqualTo("192.168.0.1")
    assertThat(

  private fun verifyIpAddress(
    ipAddress: String,
    certificate: X509Certificate,
  ): Boolean {
    val canonicalIpAddress = ipAddress.toCanonicalHost()

    return getSubjectAltNames(certificate, ALT_IPA_NAME).any {
      canonicalIpAddress == it.toCanonicalHost()
    }
  }

  /** Returns true if [certificate] matches [hostname]. */
  private fun verifyHostname(
    hostname: String,

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3

import java.net.InetSocketAddress
import java.net.Proxy
import okhttp3.internal.toCanonicalHost

/**
 * The concrete route used by a connection to reach an abstract origin server. When creating a
 * connection the client has many options:
 *

    domain: String,
    registrablePart: String?,
  ) {
    val canonicalDomain = domain.toCanonicalHost() ?: return
    val result = publicSuffixDatabase.getEffectiveTldPlusOne(canonicalDomain)
    if (registrablePart == null) {
      assertThat(result).isNull()
    } else {
      assertThat(result).isEqualTo(registrablePart.toCanonicalHost())
    }
  }