private static <T> T unchecked(Callable<T> callable) {
        try {
            return callable.call();
        }
        catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
Returns a response with a 2XX status code, after the specified number of attempts, or throws.
hosted-api/src/main/java/ai/vespa/hosted/api/ControllerHttpClient.java