Not working

[scippio]

Sorry, I don't have any details, but it's not working with any Caddy version...

[aablinov]

Thanks for the report I will see soon

[scippio]

I reported to caddy: caddyserver/caddy#2441

[aablinov]

@scippio I checked and all work's fine. I don't understand your Caddyfile try it make simple, like this:

YOU_DOMAIN.COM {
    geoip /Downloads/GeoLite2-City.mmdb
    proxy / localhost:3000 {
     header_upstream Country-Code {geoip_country_code}
    }
}

[scippio]

You using proxy .. it's not simple as my Caddyfile... Try it without proxy like me (I'm using your github example (1)):

YOU_DOMAIN.COM {
    tls off
    root /srv/html
    geoip /Downloads/GeoLite2-City.mmdb
    header Country-Code {geoip_country_code}
}

What version of Caddy you use? I tried every versions... and compile source and never worked.. + nor official Caddy from there https://caddyserver.com/download not working with geoip.
I'll try it with proxy like you and report result.