POST via App proxy stopped working

[remy727]

@daryl, looks like the issue is related to this post:

Missing Shopify-Ipgeo-Country and X-Shopify-Client-IP in app proxy requests?

Hi everyone, I just realized Shopify seems to have removed Shopify-Ipgeo-Country and X-Shopify-Client-IP from app proxy requests. Our app was using these headers to detect customer country and IP, and they suddenly disappeared without any change on our side. Has anyone else run into this? Also, was there any changelog or official update related to this change, and is there a recommended replacement for these headers?