Public IP Address You can always use your own nginx instead of using 3rd party services when you need to know your public IP. Like this: # Public IP location = /ip { default_type text/plain; return 200 $remote_addr; } Or if you need it in JSON format like this: # Public IP JSON location = /ip_json { default_type application/json; return 200 "{\"ip\":\"$remote_addr\"}"; }
When running a website behind a load balancer and Cloudflare, handling client IPs in Nginx can be tricky. Different setups use different headers to pass the real IP: Custom Domains via Cloudflare: Cloudflare sends the real client IP in the CF-Connecting-IP header. Direct CNAME to Load Balancer: The load balancer sets the real client IP in the X-Forwarded-For header. What is the challenge? Nginx’s real_ip_header directive doesn’t support variables. This limitation means you can’t conditionally choose between headers like X-Forwarded-For and CF-Connecting-IP. ...