Hi,
Apologies for the late reply. Do you mind sharing the link to your experiment and API gateway URL with me, here or at support@pcibex.net so I can proceed to some tests for troubleshooting? Thank you
EDIT: after an email exchange, it was determined that this was a case of Cross-Origin Resource Sharing (CORS) misconfiguration on the API gateway’s side that comes with the default configuration. It was fixed by opening the API gateway in the AWS console, visiting the CORS tab, and then clicking the “Clear” button: after that, the API allows the Lambda function to return the headers, including the CORS-relevant ones
Jeremy