Unable to use CloudFront Function "Test" Feature with host.value

[nCubed]

Doubt this is actually the correct place to report; maybe the repo owner could send this up the chain?

When using the property for the host header value in a CloudeFront Function and then testing with the "Test" tab, the test fails with the error:

The CloudFront function associated with the CloudFront distribution is invalid or could not run. TypeError: cannot get property "value" of undefined

Property used: event.request.headers.host.value

The example event in the AWS documentation for CloudFront Event Structure > Example Event shows this is a valid path and is also used in the redirect-based-on-country sample.

Reproducible Example

Create a new function with the following basic structure:

function handler(event) {
    var host = event.request.headers.host.value

    return request
}

Expected result: Execution result status succeeded

Actual result: Execution result status failed
Output: The CloudFront function associated with the CloudFront distribution is invalid or could not run. TypeError: cannot get property "value" of undefined

Works in Practice

Oddly enough, the host value is evaluated correctly when CloudFront executes the function. Just seems to be an issue in the Test sandbox.

[brittandeyoung]

Does your test data contain a defined host header?

From this error, it appears your request test data does not have a host header defined.

[nCubed]

Dunno 🤷🏼 This is 3 years later. Will close this out.