CD

Cloudflare Developers•2y ago•

5 replies

andriy

how to get `CF-IPCountry` header info of `X-Forwarded-For` header if it's present?

We use cloudflare workers for analytics and things of that nature. Sometimes we recommend that people send us analytics data via reverse proxy. This means that the

CF-Connecting-IP

CF-Connecting-IP

ip address becomes that of the proxy server and

X-Forwarded-For

X-Forwarded-For

is the ip of the end user.

This all works great except

CF-IPCountry

CF-IPCountry

becomes the geo location (Country, region, etc) of the reverse proxy and not the end user. So basically when we group our analytics data by country, it becomes incorrect.

Is there a way to rewrite worker headers to (if there is a

X-Forwarded-For

X-Forwarded-For

address, to use that to generate

CF-IPCountry

CF-IPCountry

?

I was looking for ways to modify request headers in docs here but not sure if what I am describing above is possible. Ref: https://developers.cloudflare.com/rules/transform/request-header-modification/

Cloudflare Docs

HTTP request header modification rules · Cloudflare Rules docs

Use HTTP request header modification rules to manipulate the headers of HTTP requests sent to your origin server.