Update app.py

app.py

@@ -79,7 +79,7 @@ async def proxy_to_node(request: Request):
     r = await client.send(req, stream=True)
 
     return StreamingResponse(
-        r.aiter_raw(), background=BackgroundTask(r.aclose), headers=r.headers
+        r.aiter_raw(), headers=r.headers
     )