204 api lambda responses fail aws cloudfront validation due to body property inclusion

[joemclo]

Describe the bug

When returning a status code of 204 in the response of a next api route, AWS lambda at edge raises an validation error Response Contains a Body and Specifies 204 (No Content) for Status due to the presence of the body property in the response object.

To Reproduce

Take an example next api handler

export default (req, res) => {
    res.status(204).end();
};

The res object with be transformed into a lambda at edge response object by

packages/lambda-at-edge-compat/next-aws-cloudfront.js:handler

However this does not take into account the need to omit the body object with a 204 response as detailed here under errors:
https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/lambda-generating-http-responses-in-requests.html

So for a 204 status response, a body property with an empty value is included and the cloudfront validation fails.

Expected behavior
If an API handler returns a status of 204, the cloudfront response object should omit the body property.

[danielcondemarin]

A fix should be available in: [email protected] 🥳 Let me know if you are still having issues.