Cannot GET /groups/%e9%98%bf%e5%b7%b4%e9%98%bf%e5%b7%b4/forum/discussion/%e8%ae%a9%e6%88%91%e5%85%88%e6%9d%a5%e6%b0%b4%e4%b8%8a%e4%b8%80%e8%b4%b4/