If server-side encryption with a customer-provided encryption key was
requested, the response will include this header confirming the encryption
algorithm used.
If server-side encryption with a customer-provided encryption key was
requested, the response will include this header to provide round-trip
message integrity verification of the customer-provided encryption key.
If present, specifies the AWS KMS Encryption Context to use for object
encryption. The value of this header is a base64-encoded UTF-8 string
holding JSON with the encryption context key-value pairs.
If present, specifies the ID of the AWS Key Management Service (AWS KMS)
symmetric customer managed customer master key (CMK) that was used for the
object.