redirect on response

[cipribucur]

hi guys, my use case is if the response is 404 from S3, to redirect to the original source to create it.

currently if I do

function handler(event) {
    var response = event.response;
    if (response.statusCode == '404') { 
            var newResponse = {
                        statusCode: 302,
                        statusDescription: 'Found',
                        headers:{ 
                            "location": { "value": "https://alternative-cdn-cname.com/path-to-regenerate-asset/" } 
                        }
             }
    }
    return newResponse;
}

on the response I get

502 ERROR
The request could not be satisfied.
The CloudFront function tried to add, delete, or change a read-only header.

1. is there a way to create a redirect (edit location header) on the response?
2. can lambda solve this?

Thanks.

[Eforen]

I have this same problem!

[rbpltr]

Could you achieve this using custom error responses to respond with an HTML file that has a <meta http-equiv="refresh"> redirect?

[stschulte]

The original code seems to be incorrect. It returns newResponse but if the original status code is != 404, newResponse is not set.