Update app.py

app.py

@@ -19,7 +19,7 @@ from typing import Dict, List
 # --- Library Imports ---
 import aiohttp
 from fastapi import FastAPI, UploadFile, File, Form, HTTPException
-from fastapi.responses import FileResponse
+from fastapi.responses import FileResponse, JSONResponse
 from starlette.background import BackgroundTask
 
 # ==============================================================================