Custom subdomain + www redirection

[linogaliana]

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I am trying to deploy my github pages website to custom subdomain.

Repository is there and everything works fine to deploy to https://slidespython.linogaliana.fr (I followed the documentation and set my DNS records as indicated).

However, when adding the www to the URL, i.e. https://www.slidespython.linogaliana.fr, I encounter an error.

I have checked github pages documentation, for instance this page. There are examples of www.example.com or blog.example.com to set the DNS record approprietely but there are never examples of both at the same time: www.blog.example.com. I have a redirection working for the www subdomain of my root domain (https://www.linogaliana.fr and https://linogaliana.fr both work fine) but I don't manage to do that for my other subdomains.

Is it impossible to do both at the same time ?

[jdevfullstack]

not sure if I'm getting it correctly but

It is possible to have a subdomain like www.slidespython.linogaliana.fr, but it requires additional DNS configuration.

Here's how you can do it:

1. In your DNS settings, create a CNAME record for www.slidespython pointing to username.github.io, where username is your GitHub username.

2. In your GitHub Pages repository, create a file named CNAME in the root directory. The contents of the CNAME file should be www.slidespython.linogaliana.fr.

3. Wait for the DNS changes to propagate. This can take anywhere from a few minutes to 48 hours.

Please note that the www in www.slidespython.linogaliana.fr is considered part of the subdomain, not a separate subdomain on its own. So you're not really using two subdomains at the same time, but rather a single subdomain that happens to start with www.

Also, keep in mind that GitHub Pages only supports HTTP, not HTTPS, for custom domains. If you need HTTPS, you'll need to use a third-party service like Cloudflare.

[LiteBrite82]

@jdevfullstack @linogaliana
that last part:
Also, keep in mind that GitHub Pages only supports HTTP, not HTTPS, for custom domains. If you need HTTPS, you'll need to use a third-party service like Cloudflare.
Is only partly true. GitHub does not do it natively; but we do have an automated process through "Let's Encrypt": Securing your GitHub Pages site with HTTPS