GET /topic/%23%E0%B8%84%E0%B8%A7%E0%B8%B2%E0%B8%A1%E0%B9%84%E0%B8%AE%E0%B9%82%E0%B8%8B%E0%B9%83%E0%B8%99%E0%B8%A7