The http crate was finally publicly announced. To encourage wide compatibility and unity, the HTTP types used by Ingots should come from this crate if possible.

Ideally the API should support both sync and async workflows, but that may prove to be too complicated for a single API. Should there be separate sync and async interfaces?

If we use generics over something that determines whether the implementation is asynchronous, then we have to make Ingot generic and not Ingot::handle(), otherwise we prevent making instances into trait objects.

"Ingots" is kind of cute, but it s also a little silly. Perhaps we can come up with a better name for the interface and surrounding libraries.