I’m not sure I can choose how CloudFlare requests assets on Netlify, I only added some CNAME records and it worked:
This works well with the “full” SSL setting in CloudFlare, but not the “flexible” one:
It appears to be because CloudFlare requests Netlify over HTTP, not HTTPS:
https://support.cloudflare.com/hc/en-us/articles/115000219871#h_dfa85774-c19f-4f49-b11b-bf9bacf6e831
Which makes sense to always use the “full” setting with Netlify then.
The weird thing is that it didn’t cause any issue with another similar setup at whenwillyoucrack.com.
The only difference is that I didn’t first use the Netlify DNS.
Anyway, thanks for all the help! All good now 