It is crazy that S3 still does not have a comparable header. It's the single biggest miss they're sitting on right now as far as I'm concerned.

> x-goog-if-generation-match

Is that an ETag-alike?

yes. i don't really understand why they don't call it an ETag

maybe because you're more likely to have the same generation for different paths, because it's not a hash? an ETag also isn't guaranteed to be a hash, though, so idk

Yeah true - an ETag is just matches/doesn't match.