Write and create a Lambda@Edge function
To use Lambda@Edge, you write the code for your Amazon Lambda function. To help you write Lambda@Edge functions, see the following resources:
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Lambda@Edge event structure – Understand the event structure to use with Lambda@Edge.
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Lambda@Edge example functions – Example functions, such as A/B testing and generating an HTTP redirect.
The programming model for using Node.js or Python with Lambda@Edge is the same as using Lambda in an Amazon Web Services Region. For more information, see Building Lambda functions with Node.js or Building Lambda functions with Python in the Amazon Lambda Developer Guide.
In your Lambda@Edge function, include the callback parameter and return
the applicable object for request or response events:
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Request events – Include the
cf.requestobject in the response.If you're generating a response, include the
cf.responseobject in the response. For more information, see Generate HTTP responses in request triggers. -
Response events – Include the
cf.responseobject in the response.
After you write your own code or use one of the examples, you then create the function in Lambda. To create a function or edit an existing one, see the following topics:
After you create the function in Lambda, you set up Lambda to run the function based on specific CloudFront events, which are called triggers. For more information, see Add triggers for a Lambda@Edge function.