That's the opposite of what the question is asking for. They want to call fetch('/api/foo/bar') but on the client it does an HTTP call while on the server it re

That's the opposite of what the question is asking for. They want to call fetch('/api/foo/bar') but on the client it does an HTTP call while on the server it recognizes that /api* is on the local system and therefore invoke that local route instead of doing an unnecessary http call. That's what I'm apparently failing to describe how to accomplish :).