etag = response.getOptions().getETags().get(0);
System.out.println(response.getCode() + " - ETag [" + Utils.toHexString(etag) + "]");
System.out.println(response.getResponseText());
System.out.println("---------------\nGET /validate with ETag\n---------------");
response = client.validate(etag);
etag = response.getOptions().getETags().get(0);
System.out.println(response.getCode() + " - ETag [" + Utils.toHexString(etag) + "]");
System.out.println(response.getResponseText());
System.out.println("---------------\nPUT /validate stimulus\n---------------");