GET /topic/%40/%23%E5%AF%8C%E8%A3%95%E5%B1%A4%E3%81%AB%E8%AA%B2%E7%A8%8E%E3%81%97%E6%B6%88%E8%B2%BB%E7%A8%8E%E6%B8%9B%E7%A8%8E%E3%82%92