This is what we used to find a line break in the headers from Hyperikon via cURL. Make sure to use a ming client like Git Bash not Powershell or windows command line.
Use this to see what Cloudflare returns:
curl -sSL -D - www.hyperikon.com -o /dev/null
Use this to go around cloudflare, substitute your own domain & server IP:
curl -svo /dev/null --header "Host: hyperikon.com" http://192.200.182.31/