At the time of that blog post, the book was already at 13,000 words and 115 written subsections. I still had that naive hope that I would have it nearly “complete” by the summer of 2016. Always the optimist.
Today, the book is at over 72,000 words with content in 600 subsections – with just 21 subtitles noted “TBD” to signal that there’s still content to add there. The PDF version of it now clocks in at over 400 pages.
I’ve come to realize and accept that it will never be “complete” and that we will just keep on working on it indefinitely since curl itself keeps changing and we keep improving and expanding texts in the book.
Right now, we have 21 sections marked as not done, but then we’ve also added features through these five years that we haven’t described in the book yet. And there are probably other areas still missing too that would benefit the book to add. There’s no hurry, we’ll just add more content when we get around to it.
Everything curl is quite clearly the most complete book and resource about curl, libcurl, the project and how all of it works. We have merged contributions from 39 different authors and we’re always interested in getting more help!
We’ve printed two editions of the book. The 2017 and the 2018 versions. As of 2020, the latest edition is out of print. If you really want one, email Dan Fandrich as mention on the web page this link takes you to. Maybe we can make another edition reality again.
The book was always meant to remain open and free, we only sell the printed version because it costs actual money to produce it.
For a long time we also offered e-book versions of everything curl, but sadly gitbooks removed those options in a site upgrade a while ago so now unfortunately we only offer a web version and a PDF version.
There are many books that mention curl and that have sections or parts devoted to various aspects of curl but there are not many books about just curl. curl programming (by Dan Gookin) is one of those rare ones.