thinQmaster Virtual testing partner Adaptive practice exams that find your weak spots and drill them. Every answer explained. From $69
Enroll

thinQmaster

Find your exam

Five questions free, before you decide.

Step 1 · choose a vendor

In one of our camps? Your practice exams come with the tuition — they are on your study page already.

Cloud Computing · Advanced

Lambda@Edge

CloudFront feature that runs Lambda functions at regional edge caches in response to viewer and origin request/response events.

Definition

Lambda@Edge functions run Node.js or Python code for tasks such as authentication, header manipulation, A/B testing and dynamic origin selection. They support all four CloudFront event triggers, network access and longer execution than CloudFront Functions, at higher cost and latency.

Example

A Lambda@Edge origin request function routes mobile users to a different origin based on device headers.

Exam tip

Lightweight header rewrites and redirects at massive scale fit CloudFront Functions; network calls or origin events need Lambda@Edge.

Related terms