Lesson 7.4

handle composes and runs the stack

Rewrite App.handle to select middleware, compose the three bands, dispatch them, then generate OPTIONS/405/404 only when nothing responded.

28 minsrc/app.js
What you will build
  • Walk the _use list to build band 1 and band 2 and resolve the route, in registration order.
  • Compose [band1, band2, band3], run dispatch, and decide the fallback from headersSent and whether a route matched.
  • Select GET before dispatch for automatic HEAD, suppress every HEAD body, and keep OPTIONS/405/404 in the fallback branch.
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