[
    {
        "AllowedHeaders": [
            "*"
        ],
        "AllowedMethods": [
            "GET"
        ],
        "AllowedOrigins": [
            "http://localhost:3000"
        ],
        "ExposeHeaders": [
            "Content-Length"
        ]
    }
]

This is the new way in which you need to provide the CORS configuration now.

You can refer to below docs for reference:
https://docs.aws.amazon.com/AmazonS3/latest/userguide/ManageCorsUsing.html