curl完全マニュアルみたいなやつ(curlは多機能すぎるからね)
公式が用意してくれているのでエビデンスとしてもちゃんとしてるはず
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.
