Servidor Node.JS para consulta de CEP nos Correios

correios-rastro.js

var soap = require('soap');
var fs = require('fs');
var app = require('express')();

var privateKey  = fs.readFileSync('/etc/apache2/ssl.crt/mydomain.key');
var certificate = fs.readFileSync('/etc/apache2/ssl.crt/87g4d56efa87af4.crt');
var chainFile   = fs.readFileSync('/etc/apache2/ssl.crt/gd_bundle-g2-g1.crt');
var credentials = {key: privateKey, cert: certificate, chain: chainFile};

var https = require('https').Server(credentials, app);

var url = "https://apps.correios.com.br/SigepMasterJPA/AtendeClienteService/AtendeCliente?wsdl";
var options = {
  ignoredNamespaces: {
    namespaces: ['targetNamespace', 'typedNamespace'],
    override: true
  }
};

app.get('/', function(req, res){
        res.setHeader('Access-Control-Allow-Origin', '*');
        var cep = req.query.cep.replace("/\D/", '');
        if (cep.length == 8) {
                soap.createClient(url, options, function(err, client) {
                        if (err) {
                                res.json(false);
                        } else {
                                client.consultaCEP({cep:req.query.cep}, function(errCli, result) {
                                        res.json(errCli ? false : result['return']);
                                });
                        }
                });
        } else {
                res.json(false);
        }
});

https.listen(3000);