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I think that localhost:80 is IP v4. have you tried

curl -k http://[::1]:80/

You may also like to look at: https://httpie.io/ It's a sweet CLI for HTTP(s)

@white-garden-41931 as you can see in the 3rd line, I'm already trying

::1:80

... the problem is not the client

Oh! OK. Thanks for the link to the tutorial, btw, It might help to have a little more context. Could you capture the output of `curl -VVV localhost:80" ? The tutorial assumes networking is already working, so it would be good to make sure that you can make an IPv4 request to your IPv6 server.

nothing changes by adding verbosity... same output

I see. In that case, if I understand your error message,

*   Trying 127.0.0.1:80...
* connect to 127.0.0.1 port 80 failed: Connection refused

is expected because there is no IPv4 the next part is where it tries IPv6

*   Trying ::1:80...

Does it return an error message or does it just hang there with no response?

it times out, no response