Function actix_service::fn_cfg_factory

pub fn fn_cfg_factory<F, C, R, S, E>(f: F) -> FnNewServiceConfig<F, C, R, S, E> where
    F: Fn(&C) -> R,
    R: IntoFuture<Error = E>,
    R::Item: IntoService<S>,
    S: Service, 

Create NewService for function that can produce services with configuration