This is nothing new and doesn't add anything new to the topic, so am I the only that thinks this is just an attempt at boosting their SEO through HN?
I’m sorry you didn’t get anything out of it. I wasn’t operating at the edge of caching knowledge, just a person refreshing and clarifying for themselves how caching works. Some things were new to me, and after spending so much time with the RFC, I just thought others may benefit or, more selfishly, would point out errors or ways to make it better.
I mean, do those <meta> tags really suggest someone who’s into SEO? Call me stale but what I really want is validation :-)
It clearly notes that it's "a refresher", does not claim that it's novel research, and extensively links to the reference documents. It is, essentially, a review article (https://en.wikipedia.org/wiki/Review_article). And there's absolutely nothing wrong with that.
Hell, the author could probably have called it a primer and I think it'd have been fair.