F# Web API controller

webapicontroller.fs

type ExampleRequest =
    { Name : string
      Age : int }

type ExampleController() = 
    inherit ApiController()
    /// Maps to HTTP GET.
    member __.Get(id : string) = 
        sprintf "Hello %s from F#!" id
    
    /// Maps to HTTP POST.
    member __.Post(request : ExampleRequest) = 
        async {
            return match request.Age with
                   | 18 -> "You are 18!"
                   | _ -> "You are not 18!"
        } |> Async.StartAsTask // can easily make asynchronous controller methods.