Set X-Real-IP to Cf-Connecting-IP If exists

[nick-perry14]

Hi all, I have NPM set up with a custom dns server to do the following:

If external to network, proxy through cloudflare,
If internal, use NPM's internal IP.

As such, I would like to set X-Real-IP to the local ip accessing when internal (which should already be done automatically) but set it to the external IP (by using the value of Cf-Connecting-IP) when it's external.

The easiest way to do this would probably be to check the presence of the Cf-Connecting-IP header, and if it exists, set X-Real-IP to it. Is this possible using custom nginx config in NPM, and if so, what would that look like.

Thanks!