private static Map<String, String> performRequests(List<String> urls, CloseableHttpClient httpClient) throws IOException {
        Map<String, String> outputs = new LinkedHashMap<>();
        for (String url : urls) {
            outputs.put(url, performRequest(url, httpClient));
        }
        return outputs;
    }
Tool to verify that configs across multiple config servers are the same.

@author Ulf Lilleengen
config-proxy/src/main/java/com/yahoo/vespa/config/proxy/ConfigVerification.java