static String buildUnauthenticatedServletPath(final String... parts) {
        return new Builder()
                .addPathPart(ROOT_PATH)
                .addPathParts(parts)
                .build();
    }
Creates a full path (including root) to an unauthenticated servlet ending in parts
stroom-util-shared/src/main/java/stroom/util/shared/ResourcePaths.java