.flatMap(properties -> properties.entrySet().stream())
                .filter(e -> e.getValue() != null)
                .collect(Collectors.toMap(
                        e -> String.valueOf(e.getKey()), e -> String.valueOf(e.getValue()), (k1, k2) -> k2));
    }

    private String getUserAgent() {
        String version = runtimeInformation.getMavenVersion();
        version = version.isEmpty() ? version : "/" + version;