How to bypass router for certain URLs with Vue Router?

Question

I'm using Vue Router with Vue 3 in a web application I'm working on, and have a 'catch all' route defined as the last route:

{
    path: "/:catchAll(.*)*",
    component: () => import("pages/Error404.vue")
  },

This is picking up everything, though, including calls to the /api/ back end (although not via Ajax), and even things like '/test.csv', which is a link to a CSV file in the root directory. How can I bypass the router for certain URLs, allowing them to be treated as regular requests? Incidentally, I don't know whether this is relevant, but the application in question is a PWA built using Quasar. When I make the call to e.g '/test.csv', I see a request for 'service-worker.js' with a 304 response code in my nginx access log, confirming that the request is being handled by the router rather than nginx.