changfu2021

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> Does the Flask server work good when you remove the `app.add_url_rule()` line ? I tried delete the app.add_url_rule() line, and if host='0.0.0.0', then the server can start but can...

so i tried to remove the ssl_context parameter, and add debug=True, it become this: app.run(debug=True,host='localhost', port=5000) it still not work,the server can not be started: * Serving Flask app ''...

![image](https://user-images.githubusercontent.com/95741127/146336101-216010f0-47c4-405e-b924-9d3e567d6c3b.png)