title: how to convert request.url to String
body: <p>For the string, <code>"http://localhost:9090/calculator?oper=add&amp;n1=10&amp;n2=20",</code></p>
  
  <pre><code>console.log(url.parse(req.url).query);
  // gives `oper=add&amp;n1=10&amp;n2=20`
  </code></pre>
  
  <p>whereas</p>
  
  <pre><code>console.log(querystring.parse(req.url));
  // gives { '/calculator?oper': 'add', n1: '10', n2: '20' }`
  </code></pre>
  
  <p>However, I'm not able to split it as these are objects, and not Strings. How do I convert them to strings?</p>