private String webSocketMasterUrl() {
        // The mock WebServer can't handle WebSocket over HTTP/2.
        return client.getConfiguration().getMasterUrl().replace("https", "ws+h1");
    }
Tests a {@link HttpClient} at or below the {@link KubernetesClient} level.
kubernetes/src/test/java/com/linecorp/armeria/client/kubernetes/ArmeriaHttpClientTest.java