GET /topic/%23%E3%83%AC%E3%82%A4%E3%81%8F%E3%82%93j%E3%83%9E%E3%82%B9%E3%82%B3%E3%83%83%E3%83%88%E7%B7%8F%E9%81%B8%E6%8C%99