title: Angular: Allow standalone html file to be loaded
body: <p>I'm using oidc-client.js silent renew feature and need to load standalone html file to be able to finish renewal process.</p>
  
  <p>Right now every url with dev server host (f.e. <a href="http://localhost:4200/silent-renew.html" rel="nofollow noreferrer">http://localhost:4200/silent-renew.html</a>) gets hooked by angular router and processed accordingly to route table, so I keep ending up on default page instead of silent renew page.</p>
  
  <p>Is there a way to tell angular to not process that concrete url, so plain html page can be loaded?</p>