Update app.py

app.py

@@ -63,7 +63,7 @@ def get_args_parser():
     parser_url = parser.add_mutually_exclusive_group()
     parser_url.add_argument("--local_network", action='store_true', default=False,
                             help="make app accessible on local network: address will be set to 0.0.0.0")
-    parser_url.add_argument("--server_name", type=str, default=None, help="server url, default is 127.0.0.1")
+    parser_url.add_argument("--server_name", type=str, default="0.0.0.0", help="server url, default is 127.0.0.1")
     parser.add_argument("--image_size", type=int, default=512, choices=[512, 224], help="image size")
     parser.add_argument("--server_port", type=int, help=("will start gradio app on this port (if available). "
                                                          "If None, will search for an available port starting at 7860."),