This is client API (go to server)
module Down : sig..end
type 'a t = 'a React.E.t
val set_handle_react_exn_function :
(?exn:exn -> unit -> unit Lwt.t) -> unit
Makes possible to customize the function called when comet fails in Eliom_react, for example because a channel is full or closed. It is called for each exception.