Thank you !

Because the correct address is :  http://api.sidra.ibge.gov.br/values/t/1736/n1/all/v/all/p/all/d/v44%202,...

That C# code is not working anymore. They presented it just as a sample. 

Anyway, as I posted here, the problem is solved. Thank you for your attention !

Problem solved !

/// Contém os dados do INPC para calculos financeiros
Class User.TabelaINPC Extends (%Persistent, %JSON.Adaptor)
{ Property Mes As %Integer [ Required ]; Index MesIndex On Mes [ Unique ]; Property Descricao As %String [ Required ]; Property Valor As %Double [ Required ]; ClassMethod leINPC() As %Status
{
Set result = ##class(%Net.HttpRequest).%New()
Set result.Server = "api.sidra.ibge.gov.br"
set result.SSLConfiguration = "padrao"
set result.Https = 0 --- HTTPS MUST Be ZERO, although there is a redirect to https in the browser
set result.SSLCheckServerIdentity = 0
set result.FollowRedirect = $$$YES
set result.ContentType = "application/json"
TRY {
set status = result.Get("/values/t/1736/n1/all/v/all/p/all/d/v44%202,v68%202,v2289%2013,v2290%202,v2291%202,v2292%202?formato=json")
set response = result.HttpResponse.Data
write "HTTP_CODE:"_result.HttpResponse.StatusCode,!
set dados = {}.%FromJSON(response)
set formatter = ##class(%JSON.Formatter).%New()
do formatter.Format(dados)
set iterator = dados.%GetIterator()
while iterator.%GetNext(.key, .value) { write "element:"_key_"=/"_value_"/ ",!} }
CATCH erro {
write "ERRO:",!
write erro.Name_", "_erro.Location_", error code "_erro.Code,!
do $system.OBJ.DisplayError()
RETURN erro.AsStatus()
}
Quit $$$OK
}

Thank you for the help Timothy !