Lambda@Edge functions are Lambda functions that are subscribed to events emitted from a CloudFront distribution's request cycle. Once a Lambda@Edge Function is defined, it gets propagated to all of the AWS edge locations around the world.
As a result, it allows you to modify static content or responses that are cached at edge locations which saves time and improves performance.
With that in mind, this resource is suitable for latency sensitive use cases in which your end users are distributed globally. Decisions on how to serve content to end users can be made based on user characteristics gathered at CDN edge locations.
Lambda@Edge use cases include:
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