GET /topic/%23%E8%87%AA%E5%88%86%E3%82%92%E3%81%82%E3%82%8A%E5%BE%97%E3%81%AA%E3%81%84%E3%81%BB%E3%81%A9%E3%81%AE%E9%9B%91%E3%81%95%E3%81%A7%E7%B4%B9%E4%BB%8B%E3%81%99%E3%82%8B