Everything curl is an extensive guide for all things curl. The project itself, the command-line tool, the library, how everything started and how it came to be the useful tool it is today. It explains how we work on developing it further, what it takes to use it, how you can contribute with code or bug reports and why millions of existing users use it.

This book is meant to be interesting and useful to both casual readers and somewhat more experienced developers. It offers something for everyone to pick and choose from.

Do not read this book from front to back. Read the chapters or content you are curious about and flip back and forth as you see fit.

This book is an open source project in itself: open, completely free to download and read. Free for anyone to comment on, and available for everyone to contribute to and help out with. Send your bug reports, ideas, pull requests or critiques to us and I or someone else will work on improving the book accordingly.

This book will never be finished. I intend to keep working on it. While I may at some point consider it fairly complete, covering most aspects of the project (even if only that seems like an insurmountable goal), the curl project will continue to move so there will always be things to update in the book as well.

This book project started at the end of September 2015.

https://everything.curl.dev is the home of this book. It features the book online in a web version.

This book is also provided as a PDF and an ePUB.

The book website is hosted by Fastly. The book contents is rendered by mdBook since March 18th, 2024.

All book content is hosted on in the https://.com/curl/everything-curl repository.

With the hope of becoming just a co-author of this material, I am Daniel Stenberg. I founded the curl project and I am a developer at heart—for fun and profit. I live and work in Stockholm, Sweden.

All there is to know about Daniel can be found on daniel.haxx.se.

If you find mistakes, omissions, errors or blatant lies in this document, please send us a refreshed version of the affected paragraph and we will amend and update. We give credit to and recognize everyone who helps out.

Preferably, you could submit errors or pull requests on the book's page.

Lots of people have reported bugs, improved sections or otherwise helped make this book the success it is. These friends include the following:

AaronChen0 on , alawvt on , Amin Khoshnood, amnkh on , Anders Roxell, Angad Gill, Aris (Karim) Merchant, auktis on , Ben Bodenmiller Ben Peachey, bookofportals on , Bruno Baguette, Carlton Gibson, Chris DeLuca, Citizen Esosa, Dan Fandrich, Daniel Brown, Daniel Sabsay, David Piano, DrDoom74 at , Emil Hessman, enachos71 on , ethomag on , Fabian Keil, faterer on , Frank Dana, Frank Hassanabad, Gautham B A, Geir Hauge, Harry Wright, Helena Udd, Hubert Lin, i-ky on , infinnovation-dev on , Jay Ottinger, Jay Satiro, Jeroen Ooms, Johan Wigert, John Simpson, JohnCoconut on , Jonas Forsberg, Josh Vanderhook, JoyIfBam5, KJM on , knorr3 on , lowttl on , Luca Niccoli, Manuel on , Marius Žilėnas, Mark Koester, Martin van den Nieuwelaar, mehandes on , Michael Kaufmann, Ms2ger, Mohammadreza Hendiani, Nick Travers, Nicolas Brassard, Oscar on , Oskar Köök, Patrik Lundin, RekGRpth on , Ryan McQuen, Saravanan Musuwathi Kesavan, Senthil Kumaran, Shusen Liu, Sonia Hamilton, Spiros Georgaras, Stephen, Steve Holme, Stian Hvatum, strupo on , Viktor Szakats, Vitaliy T, Wayne Lai, Wieland Hoffmann, 谭九鼎

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