Lambda@Edge, now in Preview, allows you to write functions deployed to the AWS network of Edge locations in response to CloudFront. This new feature allows you to customize or personalize content for your end users close to where they’re located, minimizing network latency. For instance, you can modify HTTP headers to personalize your application for each user, implement custom authentication or encryption logic right at the edge, detect and group users by device, support legacy devices by reformatting content on the viewer response, and much more.