Here are a few interesting things that have appeared in the S3 API since its initial release:
1) Object versioning. All objects now uniquely identified by (key, version) pair. API compatibility is maintained by supporting the notion of "current" version.
2) Object copying. Rather than an expensive S3->client->S3 round-trip, you may supply the x-amz-copy-source header to the PUT operation, causing S3 to use an existing object's data as the source for the PUT.
3) Reduced redundancy. x-amz-storage-class header may used to specify normal durability ("STANDARD") or reduced durability ("REDUCED_REDUNDANCY").
4) Regions (localization). Bucket locations may be set. Project Hail services have some notion of location as well. See if we can match up the two...
5) POST HTTP method. POST is like PUT, but can be used directly from a browser.
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