*  New: `Challenge` includes all authentication parameters.
 *  New: Upgrade to BouncyCastle 1.60, Conscrypt 1.4.0, and Okio 1.15.0. We don't yet require
    Kotlin-friendly Okio 2.x but OkHttp works fine with that series.

    ```kotlin
    implementation("org.bouncycastle:bcprov-jdk15on:1.60")
    implementation("org.conscrypt:conscrypt-openjdk-uber:1.4.0")
    implementation("com.squareup.okio:okio:1.15.0")
    ```

 * practice. Typically HTTP applications use other mechanisms for user identification and
 * authentication.
 *
 * ### Host
 *
 * The host identifies the webserver that serves the URL's resource. It is either a hostname like
 * `square.com` or `localhost`, an IPv4 address like `192.168.0.1`, or an IPv6 address like `::1`.
 *