Update app.py

app.py

@@ -12,6 +12,8 @@ app = Flask(__name__, static_url_path='/static')
 
 @app.route('/')
 def index():
+    global client
+    client = Client(base_gradio_url)
     return app.send_static_file('index.html')
 
 def save_base64_image(base64Image):