public async Task <IEnumerable <RundownFunction> > GetByHandlerAsync(EHandlerType handler)
        {
            HttpResponseMessage response = await GetAsync(GetByHandlerAddress, (nameof(handler), handler.ToString()))
                                           .ConfigureAwait(false);

            return(await response.DeserializeOrDefaultAsync <IEnumerable <RundownFunction> >().ConfigureAwait(false));
        }