private static SSLParameters tlsv12Parameters(SSLContext sslContext) {
        SSLParameters parameters = sslContext.getDefaultSSLParameters();
        parameters.setProtocols(new String[]{ "TLSv1.2" });
        return parameters;
    }
Returns the "message" element contained in the JSON formatted response.
hosted-api/src/main/java/ai/vespa/hosted/api/ControllerHttpClient.java