XmlCitizen.rb

    resource consultacep (http:Request req, http:Response res, string cep) {
        
         xml soapRequest = xml `<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" 
                                 xmlns:cli="http://cliente.bean.master.sigep.bsb.correios.com.br/">
                                <soapenv:Header/>
                                      <soapenv:Body>
                                         <cli:consultaCEP>
                                              <cep>{{cep}}</cep>
                                        </cli:consultaCEP>
                                      </soapenv:Body>
                                </soapenv:Envelope>`;
        
        req.setXmlPayload(soapRequest);