Hi,
I’m currently using the the Netlify subdomain feature and my domains are available in https but i was wondering how i can for the redirect to always be https for my subdomains?
It will happen automatically if you use a custom domain. If you need it set on plain netlify subdomains, you can create a redirect like this at the top of your redirects listings (cf Redirects and rewrites | Netlify Docs):
http://sitename.netlify.com/* https://sitename.netlify.com/:splat 301!