Amazon CloudFront caches eligible GET responses at globally distributed edge locations. After the first request is served from the API Gateway origin, subsequent requests can be returned from a nearby edge cache without invoking API Gateway’s Lambda integration. A one-hour TTL aligns with the catalog’s update frequency and substantially reduces both global network latency and Lambda invocation volume. API Gateway caching also reduces backend calls, but its cache is associated with the API stage in the deployment Region and does not provide the same globally distributed edge-cache benefit. Increasing Lambda memory might improve individual execution performance but would not eliminate repeated executions for identical catalog requests. Replacing the serverless API with an Application Load Balancer and EC2-based cache would increase operational overhead. CloudFront therefore satisfies both the global-latency and backend-load requirements.

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