As a hosting provider, you can prevent your customers from having to add support for SkipDNS Flexible SSL
on their own.
Add the following lines to your global Apache includes or to the vhosts template and all domains you host will support SkipDNS Flexible SSL by default.
If you want to provide support for Cloudflare Flexible SSL, load balancers and other proxy/forwarder software, preventing your customers from having to install plugins like "Cloudflare SSL", you can watch in the X-Forwarded-Proto header instead of the X-SkipDNS-Proto. Since X-Forwarded-Proto is a de facto standard header for such situations, we send both.