Fibers in HTTP Server: New or Reused?

I'm not at the point where I understand Fibers enough yet, but I've noticed that when running an HTTP server, every request seems to get a new Fiber (I use HttpServer.middleware.logger to log each request, and I noticed the Fiber number goes up by one on each request). Is this expected, or should they be reused?

(In case it's unexpected, my server code is at https://github.com/PREreview/coar-notify/blob/b4fe76df9ae3033370dc74a5f7926ef906db71ef/src/index.ts)
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