Angular route to server but apply token headers through interceptor

In my Angular routing, I want to add a route for serving authenticated files from the backend:

{ path: 'files/:id/:name', pathMatch: 'full', ??? }

I already have an HTTP interceptor which adds the token headers to other requests. What I want to achieve is simply that the (existing) interceptor adds the token headers, then passes the request on to the server.

(The server will then validate the authentication headers and e.g. return an image. The response will have no additional headers, the result will just be a plain image. Example: "files/1337/logo.svg".)

I don't need a component for that, do I? How can I achieve that in the simplest way?

Thanks for your help!

from Angular route to server but apply token headers through interceptor