GET http://localhost:5155/gw_ai_class/api/videos_all/2024年公文写作秋季班/27｜第29天：先进事迹专题写作/
For JSON format, add the query parameter: ?format=json
GET http://localhost:{{port}}/folder/videos_all/2024年公文写作秋季班/27｜第29天：先进事迹专题写作/
Always returns JSON with directory structure and navigation links