GET http://localhost:5155/gw_ai_class/api/videos_all/宣传信息专题/第6天 活化语言技巧讲解演示/
For JSON format, add the query parameter: ?format=json
GET http://localhost:{{port}}/folder/videos_all/宣传信息专题/第6天 活化语言技巧讲解演示/
Always returns JSON with directory structure and navigation links