doing a geo based redirection was my first golang project that got deployed to prod.

Nginx + GeoIP2 module sets a HTTP request header and proxies the request to the golang app.

The go app does a lookup from redis, based a combination of country header and some url params and responds back with a redirect header.

Hosted it on a t2 medium in EC2 and I have seen it easily handle ~1500 requests / second without any issue.