title: Pass invisible or hidden parameters using routerLink Angular
body: <p>I have router link like below:</p>
  
  <pre><code>&lt;button class="take-a-tour-btn" [routerLink]="['/dashboard', {'showTour':'show'}]"&gt;
  </code></pre>
  
  <p>I want to pass parameter <code>showTour</code>. But, when I do this, the parameter is visible in <code>url</code> and I would like to hide it. I have gone through so many references(which says about optional parameters) ,but with no success in my case. How could I solve this?</p>