Geo-Targeting using CDNs

Many content distribution networks give you tools to target your content based on the country the user is in when they make a request to your web application. Here are some examples:

AWS - Cloudfront

Use the header CloudFront-Viewer-Country

Get the country from cloudfront using django

def my_view(request):
    country = request.META.get('HTTP_CLOUDFRONT_VIEWER_COUNTRY', None)

Country from cloudfront using golang and context

import (
       "context"
       "fmt"
       "github.com/dherbst/geo-targeting/src/geo"
       "net/http"
)

func init() {
	http.HandleFunc("/country", func(w http.ResponseWriter, r *http.Request) {
		ctx := geo.WithCountry(context.Background(), r)
		country, _ := geo.CountryFromContext(ctx)
		fmt.Fprintf(w, "Country=%v\n", country)
	})
}

Google - AppEngine

Use the header X-AppEngine-Country

Akamai - ion

Use the edgescape header X-Akamai-Edgescape, look for country_code in the string.

Edgecast - WURL

Add %{geo_country} to a header using the advanced rules engine.

Cloudflare

Use the header CF-IPCountry.

Documentation