I thought it was a great introduction to the topic. I found the jump to pre-authentication a little jarring, perhaps adding an explanation as to why caching log

I thought it was a great introduction to the topic. I found the jump to pre-authentication a little jarring, perhaps adding an explanation as to why caching logged-in users is a problem would help. In the later examples, I don't think it's very clear that you're using the timestamps to show which responses are fresh and which are cached. Coloring the fresh/cached responses differently in the output might help. Look forward to your next post.