code: @GET
      @Timed
      @Produces(MediaType.TEXT_PLAIN)
      @CacheControl(mustRevalidate = true, noCache = true, noStore = true)
      public String getIdAsString(
              @HeaderParam(HttpHeaders.USER_AGENT) final String agent) {
          return String.valueOf(getId(agent));
      }
docs: Get a new ID as plain text
  
  @param agent
  User Agent
  @return generated ID