Node.js URL unshortening function

unshorten.js

var http = require("http"),
    url = require("url");

function unshortenUrl(unshortedUrl, returnFunction) {
    var urlObj = url.parse(unshortedUrl);
    var options = {
      host: urlObj.host,
      port: urlObj.port,
      path: urlObj.pathname
    };
    var req = http.request(options, function(res) {
      var headers = res.headers;
      res.setEncoding('utf8');
      if(headers.location === undefined) {
      returnFunction(unshortedUrl);
      }
      else {
          if(headers.location.indexOf('/') === 0) {
              returnFunction(unshortedUrl);
              return;
          }
       unshortenUrl(headers.location, returnFunction);
      }
    });
    req.on('error', function(e) {
      console.log('problem with request: ' + e.message);
      returnFunction(unshortedUrl);
    });
    req.write('data\n');
    req.end();
}