The Power of Middleware - Building Your Own Mini Web Framework on Rack

on YouTube ↗30m

" summary

Cuts Rack down to runnable plumbing: shows a small division app served via Rack middleware stack, demonstrates an inbound filter that parses hex params, an outbound filter that sprintf rounds the float, and an endpoint that validates params and returns 500 on bad input. Builds three routers: map-to-class (method_missing + eval), params-injection into query string, and middleware-as-blocks ala Sinatra. Code runs under rackup from a GitHub branch, most demos work but a couple of routes needed quick fixes.

AI-written summary · about

" chapters (11)

1. 0:00Intro
2. 1:30Rack
3. 5:57Inbound Filter
4. 9:00Outbound Filter
5. 10:30Endpoint
6. 11:56Routing
7. 12:34Map to a class
8. 16:52Middleware + Params
9. 20:41Middleware + Blocks
10. 24:04Thoughts on Layouts/Views
11. 24:59Questions?

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