S3ObjectMetadata

{
    "CacheControl": "string",
    "ContentDisposition": "string",
    "ContentEncoding": "string",
    "ContentLanguage": "string",
    "UserMetadata": {
        "property1": "string",
        "property2": "string"
    },
    "ContentLength": 0,
    "ContentMD5": "string",
    "ContentType": "string",
    "HttpExpiresDate": "string",
    "RequesterCharged": true,
    "SSEAlgorithm": "AES256"
}