Preserving the client IP address but changing the X-Forwarded-For header name
If you select preserve client IP from the web‑based manager or enable the http-ip-header option from the CLI you can also change the name of the X-Forwarded-For header to a custom header name. This can be useful if you want to use a custom header name instead of the standard header name.
You can configure changing the header name from the CLI. When http-ip-header is enabled you can add a custom header name to the http-ip-header-name option. If you don’t add a custom header name the X-Forwarded-For header name is maintained.