Io (cohttp-async.Cohttp

module IO : 
  Cohttp.S.IO
    with type 'a t = 'a Async_kernel.Deferred.t
     and type ic = Cohttp_async__.Input_channel.t
     and type oc = Async_unix.Writer.t

module Request : 
  Cohttp.S.Http_io with type t := Http.Request.t and module IO := IO

module Response : 
  Cohttp.S.Http_io with type t := Http.Response.t and module IO := IO