headers property
The signed headers, which the request MUST carry exactly as given: for put and
upload-part, Content-Length and x-amz-checksum-sha256; for
create-multipart, x-amz-checksum-algorithm; for complete-multipart,
x-amz-mp-object-size; for head, x-amz-checksum-mode. A consumer adds nothing
storage would treat as signed.
Implementation
final Map<String, String>? headers;