For those trying to proxy your traffic through Cloudflare and are also using Blogger.com/ Blogspot.com to host your website you may find some issues with the HTTPS redirects and general loading of your HTTPS on your website. This follows some of the posts that I have seen on the Cloudflare Community page on “Custom domain with blogger not working”. I recommend setting up the redirect on Cloudflare.com, so that Cloudflare’s edge locations will do the redirecting effort, rather than you needing the visitor to send a request back to your origin as part of the redirect work. So here’s a few things that I did to have this work.
Add four A-records which point to Google IPs.
Set my www. as CNAME to vulongtran.com (mydomain.com)
Page rule:vulongtran.com/* Forwarding URL: 301 Permanent Redirect https://www.vulongtran.com/$1