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Compute

AWS Lambda@Edge

AWS Lambda@Edge runs supported Lambda functions at CloudFront edge locations in response to viewer or origin events. It can enforce lightweight request handling near users but is not a location for invoking large models.

Key points

  • Functions are replicated from the required home Region to edge locations
  • Runtime, deployment, networking, and execution limits differ from regional Lambda
  • Viewer and origin triggers expose different request and response stages

When to use it

  • Attach tenant routing headers before a chat request reaches its origin
  • Normalize or reject malformed edge requests for an AI web application

Exam tips

  • Use CloudFront Functions for simpler ultra-low-latency JavaScript and Lambda@Edge when richer edge logic is necessary
  • Never place secrets or latency-heavy FM calls in an edge handler

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