We are currently trying out the cloudflare service to protect one of our company service. In front of this service we are using haproxy as SSL endpoint and loadbalancer. Cloudflare adds a number of custom headers((http://www.linuxorz.com/2014/10/cloudflare-haproxy-get-real-ip/)): _SERVER["HTTP_CF_IPCOUNTRY"] CN _SERVER["HTTP_CF_RAY"] 17da8155355b0520-SEA _SERVER["HTTP_CF_VISITOR"] {"scheme":"http"} _SERVER["HTTP_CF_CONNECTING_IP"] XX.YY.ZZ.00 In order to extract the original client IP in the X_FORWARDD_FOR header, you need to use the following configuration((http://permalink.gmane.org/gmane.comp.web.haproxy/12019)) in haproxy: acl FROM_CLOUDFLARE src -f /etc/haproxy/cf-ips-v4 reqidel ^X-Forwarded-For:.