There are many ways to interact with the S3 REST API and most client libraries encode assumptions about the kind of payload they're manipulating, don't quite handle errors in a way you'd like.

Talking HTTP and laying some calls together to form a domain specific client for your interaction with S3 is what this package tries to accomplish, and provides a means to sign any http.Request pointer, or return the signature for use in query string authorized S3 URLs.

I'm still writing this.