title: how do we add url parameters? (EJS + Node + Express)
body: <p>I understood how we <em>parse</em> the url parameters in express routes, as in the example </p>
  
  <p><a href="https://stackoverflow.com/questions/6912584/how-to-get-get-query-string-variables-in-express-js-on-node-js">How to get GET (query string) variables in Express.js on Node.js?</a></p>
  
  <p>But where do the url parameters come from in the first place?</p>
  
  <p><strong>EDIT:</strong> </p>
  
  <p>Apparently, I can build such a query with jquery (i.e <code>$.get</code>). I can append <code>params</code> to this query object. It s cool, but still i m trying to understand how we achieve this in the query that renders the page as a whole. </p>
  
  <p><strong>An example</strong> : when i choose the <em>oldest</em> tab below, how does SO add <code>?answertab=oldest</code> to the url so it becomes : </p>
  
  <p><code>https://stackoverflow.com/questions/30516497/how-do-we-add-url-parameters-ejs-node-express?answertab=oldest#tab-top</code> </p>