libcohttp-lwt-unix-ocaml-dev 5.1.0-1build3 (amd64 binary) in ubuntu mantic

 An implementation of an HTTP client and server using the Lwt
 concurrency library. See the Cohttp_lwt_unix module for information
 on how to use this. The package also installs cohttp-curl-lwt and a
 cohttp-server-lwt binaries for quick uses of a HTTP(S) client and
 server respectively.
 .
 Although the name implies that this only works under Unix, it should
 also be fine under Windows too.
 .
 This package contains development files.