implementation("org.conscrypt:conscrypt-openjdk-uber:1.4.0")
    implementation("com.squareup.okio:okio:1.15.0")
    ```

 *  Fix: Handle dispatcher executor shutdowns gracefully. When there aren't any threads to carry a
    call its callback now gets a `RejectedExecutionException`.
 *  Fix: Don't permanently cache responses with `Cache-Control: immutable`. We misunderstood the
    original `immutable` proposal!