
s-maxage= in it's responses?s-maxage= from the origin, but without actually touching your origin?
s-maxage= to 1y (in seconds) from your origin).

s-maxage=600" to Cloudflare.s-maxage=600", however, that isn't necessary - unless you have something in front of Cloudflare (e.g. another CDN), that needs to see it.
Single Redirects" on https://developers.cloudflare.com/rules/url-forwarding/.s-maxage=s-maxage=s-maxage=s-maxage=600s-maxage=600Single Redirects