title: Nextjs Nested Dynamic route
body: <p><code>http://localhost:3000/category/leadership/expert</code></p>
  <p><code>http://localhost:3000/category/topics/technology/business-tech-blogs</code></p>
  <p>I have category routes like this. and current file looks like this <code>pages/category/[...slug].js</code>. Its using ISR and working without a problem.</p>
  <p>Now I need a route for feed page for each of these route.
  Example</p>
  <p><code>http://localhost:3000/category/leadership/expert/feed</code></p>
  <p><code>http://localhost:3000/category/topics/technology/business-tech-blogs/feed</code></p>
  <p>How can define file for this. This will be SSR as ISR does not support <code>xml</code> content.</p>
  <p>I tried <code>pages/category/[slug]/[...params].js</code> and it works but then it breaks my category page.</p>