I've got a resource that needs the cors header Access-Control-Allow-Credentials set to false, but it is unclear how to do that via S3 in the amazon console
Have you checked this? https://aws.amazon.com/premiumsupport/knowledge-center/s3-configure-cors/
https://docs.aws.amazon.com/AmazonS3/latest/userguide/cors-troubleshooting.html
https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/understanding-response-headers-policies.html#understanding-response-headers-policies-cors
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