Lesson 8.5
Wire the demo and prove failure containment
Add four failure fixtures and one app-level error handler, then verify generic responses, keep-alive reuse, socket destruction, and continued service.
What you will build
- Add /boom, /reject, /died-mid-stream, and /custom-error without changing earlier demo routes.
- Register one app-level error handler that responds only for /custom-error.
- Verify stages 01 through 12 over real sockets.