cloudflare ERR_TOO_MANY_REDIRECTS Certbot
If you deployed your SSL certificate using Certbot and got after cloudflare ERR_TOO_MANY_REDIRECTS after turning on the proxy mode, then you perhaps you should update your SSL/TLS Encryption Mode to be Full or higher (requires an SSL certificate configured at your origin server). https://developers.cloudflare.com/ssl/troubleshooting/too-many-redirects/