On Wed, Dec 18, 2019 at 1:17 PM Manuel Guesdon <m...@sbuilders.com> wrote:
>
> - make a CNAME www.gnustep.org => gnustep.github.io (but server hosting
>    gnustep.github.io should accept requests for www.gnustep.org)

This merely requires creating a file named 'CNAME' in the github repo
for gnustep.github.io (i.e.
https://github.com/gnustep/gnustep.github.io).

See 
https://help.github.com/en/github/working-with-github-pages/managing-a-custom-domain-for-your-github-pages-site

> I can't make a CNAME gnustep.org => gnustep.github.io (due to the way DNS
> works) but I can make a 301 redirect http://gnustep.org
> => http://www.gnustep.org

Looks like Github documents the exact IPs that can be used:
  
https://help.github.com/en/github/working-with-github-pages/managing-a-custom-domain-for-your-github-pages-site#configuring-an-apex-domain

Then again, 301 + CNAME for www are probably more maintainable.

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