Update app.py

app.py

@@ -4,6 +4,7 @@ import logging
 from fastapi import FastAPI, HTTPException, BackgroundTasks
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.responses import StreamingResponse
+from fastapi.responses import RedirectResponse
 import subprocess
 from pydantic import BaseModel
 from langchain.chains import RetrievalQA