Your header is your custom way . If you add your header and the next hop is to apache or some other software (for e.g.), it won't know what you did. Proxy pro

Your header is your custom way . If you add your header and the next hop is to apache or some other software (for e.g.), it won't know what you did. Proxy protocol is a standard. Every software that supports proxy protocol reads and write it in the same way. This is supported outside of software. All clouds (AWS, GCP, Azure ) support it. So does third party services like Cloudflare - https://developers.cloudflare.com/spectrum/proxy-protocol https://developers.cloudflare.com/spectrum/proxy-protocol