I'm trying to go back and read through (completely) several books I bought way back in the day, especially those that I referenced a lot and also showed a lot of promise but maybe like the O'Reilly Cookbook books I only referred to certain recipes.
Having finished Apache Cookbook, a recipe book that I referenced quite a bit back in the day, my biggest gripe about the book was when Ken Coar referred to other maybe-not-ready-for-prime-time modules and web sites that now certain suffer from link rot, or possibly refers to things that certain were under development at the time. Lord knows I still run many Apache instances, and I still refer to many httpd.conf directives I learned a couple decades ago, but a lot of these recipes are just not great. Some are certainly dated, but others refer to my gripes above. Those that solidly refer to Apache directives that still hold true to this day are still meritorious, but others just don't make sense, even only a few years after this was published, let alone in 2023.
One may get something out of older editions of Apache Cookbook but so much has changed I'm not sure how much this book truly holds value for your serious modern Apache enthusiast.
One positive nostalgic thing is how much I wrote certain CGI in perl, used CPAN, and so on and so forth, and this book references a lot of that. Man, that takes me back. If nothing else, revisiting this book just recently is a big trip down memory lane.