really low latency
not many use case. AWS got Lambda@Edge where you run code inside CDN (AWS CloudFront). use case shown in AWS is offloading function to the edge. example, when people upload image to your app, the Lambda@Edge intercept the incoming data, scale down the image size, and sent to origin the optimized size for storage. the scaled image is also cached at CloudFront, so when user refresh the app, the got the image very quickly
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