Why is Httpclient Baseddres not working?

Question

Below my code:

using (var handler = new HttpClientHandler())
using (var client = new HttpClient(handler))
{
    client.BaseAddress = new Uri("http://localhost:porta/");

    client.DefaultRequestHeaders.Accept.Clear();
    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

    // ESSA LINHA DA O ERRO
    HttpResponseMessage response = await client.GetAsync("api/User/ObterTodosPorId/" + id);
    if (response.IsSuccessStatusCode)
    {
        string data = await response.Content.ReadAsStringAsync();
        if (data != null)
        {
            var varUsuario = JsonConvert.DeserializeObject<UsuarioModel>(data);
            usuario = varUsuario;
        }
    }
};

I’m trying to get a GET on http://localhost:port/api/User/Obttodosporid/1 (id = 1 example)

But when it hits the line I commented there in the code, no error happens, the system continues and the list that would be filled with this data is blank. (I have tested with a local fill and it worked).