private URI deploymentPath(ApplicationId id, ZoneId zone) {
        return concatenated(instancePath(id),
                            "environment", zone.environment().value(),
                            "region", zone.region().value());
    }
Returns an authenticated request from the given input. Override this for, e.g., request signing.
hosted-api/src/main/java/ai/vespa/hosted/api/ControllerHttpClient.java