`Eliom_service.preapply` fails on the client

[Zzull]

Applied services generated by Eliom_service.preapply on the server cannot be sent to the client because of a type mismatch that will fail on the client with a [eliom] Async: Ojs_exn.Error(_) :

It is using the type Eliommod_parameters.param for make_string_uri_from_components which is a string server side but a string or a file on the client