GET /topic/%23%E3%82%82%E3%81%86%E8%87%AA%E6%B0%91%E3%81%AB%E5%85%A5%E3%82%8C%E3%82%8B%E3%81%AE%E3%82%84%E3%82%81%E3%82%88%E3%81%86%E3%81%9C