Simple Notification Service (SNS)
Kinesis + MQ
Databases & Analytics
  • [email protected] is an extension of AWS Lambda, a compute service that lets you execute functions that customize the content that CloudFront delivers.
  • You can author Node.js or Python functions in one Region, US-East-1 (N. Virginia), and then execute them in AWS locations globally that are closer to the viewer, without provisioning or managing servers.
  • [email protected] scales automatically, from a few requests per day to thousands per second.
  • Processing requests at AWS locations closer to the viewer instead of on origin servers significantly reduces latency and improves the user experience.
  • When you associate a CloudFront distribution with a [email protected] function, CloudFront intercepts requests and responses at CloudFront edge locations.
  • You can execute Lambda functions when the following CloudFront events occur:
    • When CloudFront receives a request from a viewer (viewer request)
    • Before CloudFront forwards a request to the origin (origin request)
    • When CloudFront receives a response from the origin (origin response)
    • Before CloudFront returns the response to the viewer (viewer response)

Use Cases

  • A Lambda function can inspect cookies and rewrite URLs so that users see different versions of a site for A/B testing.
  • CloudFront can return different objects to viewers based on the device they're using by checking the User-Agent header, which includes information about the devices.
    • For example, CloudFront can return different images based on the screen size of their device.
  • For example, on a retail website that sells clothing, if you use cookies to indicate which colour a user chose for a jacket, a Lambda function can change the request so that CloudFront returns the image of a jacket in the selected colour.
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Use Cases