server: also listen to ipv6

[Mic92]

The [::] address will listen to both ipv4/ipv6 addresses.

[erogol]

do you have a point er for that? I checked here but no mention https://flask.palletsprojects.com/en/master/api/#flask.Flask.run

[Mic92]

"::" is the ipv6 equivalent of ipv4's "0.0.0.0" but also accepts ipv4 addresses. However as I just found out this does not work on Windows... https://stackoverflow.com/questions/57881991/python-flask-dual-stack-on-windows-ipv4-and-ipv6

[mweinelt]

Also only if the linux distro defaults to net.ipv6.bindv6only=0, thought most do.

[Mic92]

The issue is that people try to connect to localhost, which can also yield ::1 instead of 127.0.0.1 as loopback address in which case connection can fail.

[erogol]

how about if we just take an host argument and let people decide?

[Mic92]

That would also make sense but is orthogonal since this is about the default as well.
@SuperSandro just confirmed that :: actually works as intended on windows too.

[erogol]

Then I merge 👍 !!