Yoooyo / Technical reference
Understand the connection.
Practical notes on the steps between a name in your browser and a page on your screen: DNS resolution, HTTPS and the network in between.
Start with the layer you are investigating. Each note separates what a check can show from what it cannot prove.
The reference shelf
- DNS & caching
What A, AAAA and CNAME records mean, why different resolvers can disagree, and what a TTL actually controls.
- HTTPS & certificates
How the hostname, certificate and HTTP response fit together, with checks that keep certificate validation enabled.
- Connectivity checklist
A repeatable sequence for isolating name-resolution, routing, TLS and application failures without changing everything at once.
About these notes
This is a small public reference, not a live service-status page. Examples explain network behaviour; they do not certify the availability of a particular server, provider or connection.
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