I’ve been doing some server side tasks recently, and it’s hard to overestimate the usefulness of a tool called
curl. It’s an open source program which enables billions of devices to transfer data across the web in a safe and reliable way. By the way, the author of this tool has a nice blog, and he also authored a book called Everything Curl.
This book is still work in progress, but it already helped me to discover a few hidden tricks of
curl. This book is a must-read for anyone who does HTTP for a living.