Dork:
"CF-Host-Origin-IP" "CF-Int-Brand-ID" "CF-RAY" "CF-Visitor" "github"
-site:github.com -site:cloudfare.com
Replace "github.com" with any of the other Cloudfare servers as can be
found here.
https://github.com/pirate/sites-using-cloudflare
Look at cached results for data leaked from memory due to "Cloudbleed"
vulnerability.
https://blog.cloudflare.com/incident-report-on-memory-leak-caused-by-cloudflare-parser-bug/