title: how to set optional parameter in base href element in angular
body: <p>Hi i want an optional parameter to be set in so that any of below URL will respond</p>
  
  <p><a href="http://myWebsiteName/mango/myRouterPath" rel="nofollow noreferrer">http://myWebsiteName/mango/myRouterPath</a> or
  <a href="http://myWebsiteName/myRouterPath" rel="nofollow noreferrer">http://myWebsiteName/myRouterPath</a></p>
  
  <p>where mango is optional</p>
  
  <p></p>