Lambda@Edge: Run Code at the Edge with CloudFront

Lambda@Edge allows you to run AWS Lambda functions at CloudFront's edge locations globally. This results in lower latency and improved performance for users. It provides serverless computing capabilities without infrastructure management. Common use cases include redirects, security header injection, and A/B testing. Lambda@Edge functions are triggered by CloudFront events, like viewer requests and responses. A key example is adding security headers using a Node.js function associated with the viewer-response event. Deployment requires Terraform, specifying the us-east-1 region and a published Lambda version. There are limitations, including runtime restrictions to Node.js and Python, and the inability to use VPCs or custom runtimes. Alternatives include CloudFront Functions or other edge computing services. Lambda@Edge is best for lightweight transformations requiring low-latency and global distribution. It can also offload processing from the origin server and improve caching behavior.