Returning plain text reponse

app.py

@@ -1,5 +1,5 @@
 from fastapi import FastAPI, Request, HTTPException
-from fastapi.responses import JSONResponse
+from fastapi.responses import JSONResponse, Response
 import requests
 import uvicorn
 import os
@@ -23,6 +23,7 @@ async def verify_webhook(request: Request):
         params.get("hub.mode") == "subscribe" and
         params.get("hub.verify_token") == VERIFY_TOKEN
     ):
+        return Response(content=params.get("hub.challenge"), media_type="text/plain")
         return JSONResponse(content=params.get("hub.challenge"), status_code=200)
     else:
         raise HTTPException(status_code=403, detail="Verification failed")