Update app.py

app.py

@@ -40,7 +40,10 @@ async def respond(
             top_p=top_p,
             messages=messages,
         )
-        for message in stream.iterate():
+        while True:
+            message = stream.read()
+            if message is None:
+                break
             token = message.choices[0].text
             response += token
         return response