user@host % aws s3api get-bucket-cors --bucket my_bucket
{
    "CORSRules": [
        {
            "AllowedHeaders": [
                "*"
            ],
            "AllowedMethods": [
                "PUT",
                "DELETE",
                "POST"
            ],
            "AllowedOrigins": [
                "http://www.example.com"
            ]
        },
        {
            "AllowedMethods": [
                "GET"
            ],
            "AllowedOrigins": [
                "*"
            ]
        }
    ]
}