Function actix_service::apply_fn_factory

pub fn apply_fn_factory<T, F, In, Out, Cfg, U>(
    service: U, 
    f: F
) -> ApplyNewService<T, F, In, Out, Cfg> where
    T: NewService<Cfg>,
    F: FnMut(In, &mut T::Service) -> Out + Clone,
    Out: IntoFuture,
    Out::Error: From<T::Error>,
    U: IntoNewService<T, Cfg>, 

Create fractory for apply_fn service.