Update backend/app.py

backend/app.py

@@ -38,6 +38,11 @@ def serve_static(filename):
 def index(subpath=None):
     return send_from_directory(app.static_folder, 'index.html')
 
+#确保任何未知的路径都返回 index.html
+@app.route('/<path:path>', methods=['GET'])
+def catch_all(path):
+    return send_from_directory(app.static_folder, 'index.html')
+
 
 
 @app.route('/chat', methods=['POST'])