AWS Certified Developer – Associate — Question 395

An ecommerce company wants to redirect users to a country-specific website when they enter the example.com website. For example, the company wants to redirect United States users to example.com/us/ and wants to redirect French users to example.com/fr/. The web application is using Amazon CloudFront and an
Application Load Balancer with an Amazon Elastic Container Service (Amazon ECS) cluster. The application's domain name resolution is configured in an
Amazon Route 53 public hosted zone.
Which solution will meet these requirements with the LEAST operational effort?

Answer options

• A. Update the routing policy for the application's Route 53 record to specify geolocation routing. Configure listener rules based on a unique alias location to redirect requests to the correct URLs by country.
• B. Create a CloudFront function to inspect the CloudFront-Viewer-Country header and return redirect responses to different URLs based on user location.
• C. On the ECS web server configuration, use a GeoIP database to look up the requested IP address and redirect requests to the correct URLs by country.
• D. Use AWS WAF to determine the country of origin. Create an AWS WAF custom rule with a geographic match condition to redirect traffic from each country to the correct URL.

Correct answer: B

Explanation

Using a CloudFront function is the most efficient solution because it executes at the edge locations with ultra-low latency, inspecting the automatically populated 'CloudFront-Viewer-Country' header and returning a redirect response before the request ever reaches the origin. Other options, such as maintaining a GeoIP database on ECS (Option C) or configuring complex routing/WAF rules (Options A and D), require significantly more operational effort, maintenance, and resource consumption.