A company wants to design a new serverless website with customers from many countries. For a better user experience, customers from different countries should get customized contents from the website.
How would you design this solution cost-effectively?

Answer options:

A.Use Amazon Route 53 geo-based routing to route traffic to the AWS Region and generate a geography-specific URL.
B.Use a Network load balancer to route traffic to the AWS Region and replicate setup in each AWS region.
C.Use a Lambda function to identify the country and use an RDS database to return a customized URL for the customer.
D.Use Lambda@Edge to customize content based on geography that CloudFront delivers and generate geography-specific URL.

Correct Answer : D
Option A is incorrect as replicating the setup in each AWS Region would increase Operational overhead and cost.
Option B is incorrect network load balancer to route traffic is a feasible solution since NLB are regional and can not be used to route traffic across AWS regions.
Option C is incorrect because this is not the most cost-effective solution and RDS is not severless.
Option D CORRECT. Lambda@Edge function does provide the capability to customize content. Lambda@Edge allows users to run their own Lambda functions to customize the content that CloudFront delivers, executing the functions in AWS Regions closer to the viewer. Lambda functions run in response to CloudFront events, without provisioning or managing servers. So, it meets Serverless requirements. Lambda@Edge can change CloudFront requests and responses like the above diagram.
Reference:
https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/lambda-examples.html#lambda-examples-redirecting-examples