private static String setToSortedCsvStr(final Set<String> set) {
        if (NullSafe.isEmptyCollection(set)) {
            return "";
        } else {
            return set.stream()
                    .sorted()
                    .map(str -> "'" + str + "'")
                    .collect(Collectors.joining(", "));
        }
    }
Handler class that forwards the request to a URL.
stroom-pipeline/src/main/java/stroom/pipeline/writer/HTTPAppender.java