Unable to get token with golang script

[frmichetti]

I'm carrying out tests with this package of examples (where I was successful in everything in python with some small adjustments) and now I'm trying it in the golang language

I'm facing a problem getting the token:

I run the script as suggested in the documentation,
I click on the suggested link, I authorize every step but I get the error:
This site can't be reached
localhost refused to connect.

Tried with 2 different accounts; The same ones that worked with python. Does anyone know how to proceed?

Thanks!