Oauth issue

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Hi, I am trying to run this example: https://github.com/sns-sdks/python-youtube/blob/master/examples/clients/oauth_flow.py. I set my redirect uri as https://localhost/ and tried running it, I gave it all the accesses and in the end I got This site can’t be reachedlocalhost refused to connect. Try:

Checking the connection Checking the proxy and the firewall ERR_CONNECTION_REFUSED How can this be fixed? I am running it on Ubuntu 22.04, tried on Chrome and Firefox, tried stopping firewall, and nothing works