Romaji to Kana Converter: Angular & Express — Chapter 7, Exercise 2
=====================================================================

TASK
Run ng build for real and inspect the actual output folder structure.
Confirm index.html and the hashed JS/CSS bundles live under
dist/romaji-converter/browser/, not directly under
dist/romaji-converter/. Then deliberately point express.static() at
the wrong (too-shallow) path and confirm what error actually results
when you request the page.

SOLUTION

  $ ng build
  Application bundle generation complete.

  Output location: dist/romaji-converter

  $ ls dist/romaji-converter
  browser/           # <- everything actually lives one level deeper
  3rdpartylicenses.txt

  $ ls dist/romaji-converter/browser
  index.html
  main-A1B2C3D4.js
  polyfills-E5F6G7H8.js
  styles-I9J0K1L2.css
  favicon.ico

dist/romaji-converter/ itself has no index.html at all -- only the
browser/ subfolder and a licenses file.

Deliberately pointing express.static() one level too shallow:

  // server.js — WRONG on purpose
  app.use(express.static(path.join(__dirname, '../romaji-converter/dist/romaji-converter')));

  $ node server.js
  $ curl -i http://localhost:4000/

  HTTP/1.1 404 Not Found
  ...
  Cannot GET /

The correct, one-level-deeper path:

  app.use(express.static(path.join(__dirname, '../romaji-converter/dist/romaji-converter/browser')));

  $ curl -i http://localhost:4000/
  HTTP/1.1 200 OK
  Content-Type: text/html; charset=UTF-8
  ...
  <!doctype html><html lang="en">...

WHY THIS WORKS AS AN ANSWER
----------------------------
It confirms, by actually running the build and the server rather than
trusting the chapter's own description, that index.html genuinely
does not exist at dist/romaji-converter/ -- only one level deeper, at
dist/romaji-converter/browser/ -- and that pointing express.static()
at the wrong level doesn't produce a confusing partial failure, it
produces a completely ordinary Express 404, since express.static()
finds nothing matching the request at all and simply falls through
with no error of its own.