Hi, @antoinerousseau, Netlify will always serve HTTPS for any site hosted with our service.
We can only provisions automatic SSL certificates from Let’s Encrypt for domains if their DNS records point directly to Netlify using one of our two supported methods: Netlify DNS or external DNS.
There is more about this here:
Is it possible for Cloudflare to make the HTTPS requests to the subdomain of netlify.com for this site? We will serve our wildcard SSL certificate (*.netlify.com) for this domain name.
So, for example, the asset above would be at a URL similar to this:
https://example-subdomain-here.netlify.com/webpack-runtime-1e73942cf63b57021d45.js
If this isn’t possible, another solution is to upload a custom SSL certificate to Netlify and continue to update that manually each time it it going to expire.
If there are other questions about this, we’re happy to answer.