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What server implementation is the author referring to?

BuckleScript is an OCaml to JS compiler. So you can convert your code into JS and run it from Node. Or, you can simply compile it into native OCaml binary and run it just like you run a C or GoLang binary.

The choice would depend on whether you use libraries from the npm ecosystem, or from the OCaml ecosystem.

Thank you. Is there a particular native OCaml server implementation that is considered best, or at least most popular?

There is Ocsigen (https://en.wikipedia.org/wiki/Ocsigen) which lets you write OCaml on the front-end and back-end, and is a fully-featured self-contained server.

There is also Opium (https://github.com/rgrinberg/opium) which is a Sinatra-like light-weight web server.

Neither has the kind of vast community support like Rails or Django enjoys, and I haven't used them in anger either.

Yes, Cohttp is from the folks who developed the Mirage unikernel: https://github.com/mirage/ocaml-cohttp . They make lightweight stuff that runs blazing fast.

But cohttp is slow. See https://github.com/mirage/ocaml-cohttp/issues/328 and https://github.com/inhabitedtype/httpaf

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