can't use debug=True and host='0.0.0.0' if flask app integrated with PyWebIO

[changfu2021]

BUG Description

1, parameter host='0.0.0.0' can not be used but "localhost" works if original Flask application integrated with PyWebIO.
2, papameter debug=True can not be used too,
in my application, below parameter works:
app.run(host='localhost', port=5000, ssl_context=("localhost_cert.pem", "localhost_key.pem"))
details see the pictures i marked

Environment Information

• OS and Version: Windows10 +latest Pycharm PyCharm 2021.3 (Community Edition)
• Browser and Version: Chrome96
• Python Version: python3.1
• PyWebIO Version: 1.5

[wang0618]

Does the Flask server work good when you remove the app.add_url_rule() line ?

[changfu2021]

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 not be visit

[wang0618]

It seems that there are some problems with the ssl_context config. Please make sure your Flask app can work well first, and then add PyWebIO app to it via app.add_url_rule()

[changfu2021]

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 '' (lazy loading)
• Environment: production
  WARNING: This is a development server. Do not use it in a production deployment.
  Use a production WSGI server instead.
• Debug mode: on
• Restarting with stat

stopped here.