Batching with no special server support

The section Batching with no special server support in the blog post Query batching in Apollo mentions how multiple queries can be batched into a single request. Is there a doc or examples of how to do this with Apollo client?

The only doc I could find about batching is BatchHttpLink, but that requires server support for batching.

I don’t think BatchHttpLink requires special server support (except for the Persisted Queries part, which does require server support)