fix bug

app.py

@@ -64,7 +64,7 @@ def showInput(input, chatbot):
 def predict(input, chatbot, messages):
     chatbot.append((parse_text(input), ""))
     messages.append({"role": 'user', "content": input})
-    response=requests.post(os.environ.get("URL"), data=messages).content
+    response=str(requests.post(os.environ.get("URL"), json.dumps(messages, ensure_ascii=False).encode('utf-8')).content, encoding="utf-8")
     chatbot[-1] = (parse_text(input), parse_text(response))
     messages.append({"role": "assistant", "content": response})
     return chatbot, messages
@@ -87,7 +87,7 @@ def show_hide_answer():
         return gr.update(value=""), gr.update(value="Show Answer")
     else:
         show_ans = True
-        return gr.update(value=answer), gr.update(value="Hide Answer")
+        return gr.update(value=""), gr.update(value="Hide Answer")
 
 
 with gr.Blocks() as demo: