I'm attempting to change my routing based on header values.
For example, if an incoming request contains an accept header of application/json, I want to call one set of routes to return JSON data, but if it does not have that header, I want to fall back to serving static files.
According to the docs, both the Request and Parse steps come before the routing, and since there isn't an onRouting-type method, my assumption would be to get the headers in either Request or Parse, and adjust something that will affect the routing.
I thought about perhaps using a custom method, so for example if the accept header was application/json, then I could change the method to, say, JSON and then define the rest of my routes like .route('JSON', () => doTheThing()). But of course the request's method is read-only, so I can't really do that.