Is there a documentation of the http API? Anyone ever created a http backend besides api.pulumi.com?

There is not currently documentation for the API - and although it's largely stable - we haven't so far been treating it as a public API - though we very much expect to formalize and document in the not too distant future. Of course - the interactions with the API from the CLI are all fairly clear from the CLI implementation of the

httpstate

backend, and those APIs are very stable as we do not ever break compatibility for old CLIs.

awesome!