Consulta de RUC

if (ruc!.Length == 10)
{
    ruc += "001";
}
var urlConsultaContribuyente = _config["ConnectionStrings:ConsultaContribuyente"] 
    + $"api/rucAvanzado/{ruc}?pageNumber={pagenumber}&pageSize={pagesize}";

var res = await _httpClient.GetAsync(urlConsultaContribuyente);
if (res.IsSuccessStatusCode)
{
    var resConsulta = await res.Content.ReadAsStringAsync();
    // Logica adicional
}
else
{
    var resError = await res.Content.ReadAsStringAsync();
    var jsonResError = JsonConvert.DeserializeObject<DtoResponseError>(resError);
    throw new Exception(jsonResError!.message, "", jsonResError.code);
}