Learn Curl - 10 Code Examples & CST Typing Practice Test
cURL is a command-line tool and library for transferring data with URLs. It supports a vast range of protocols (HTTP, HTTPS, FTP, SMTP, SFTP, etc.) and is widely used for API testing, automation, network debugging, and data transfers.
Learn CURL with Real Code Examples
Updated Nov 21, 2025
Learning Path
Learn HTTP basics
Master common flags
Understand authentication
Use verbose mode
Integrate in scripts
Skill Improvement Plan
Week 1: Basics & GET
Week 2: Headers & POST
Week 3: Auth & tokens
Week 4: File transfers
Week 5: Debugging TLS, proxies
Interview Questions
How do you send a POST request using curl?
What does -v do?
How do you add custom headers?
Difference between curl and wget?
How to upload a file?
Cheat Sheet
curl https://api.com - simple GET
curl -X POST -d 'a=1' - form POST
curl -H 'Auth: token' - add header
curl -O file.zip - download
curl -F 'file=@path' - upload file
Books
Everything Curl
HTTP: The Definitive Guide
RESTful Web APIs
Linux Command Line and Shell Scripting
Web Protocols and Practice
Tutorials
curl for beginners
HTTP requests with curl
Uploading with curl
Verbose debugging
Scripting with curl
Official Docs
curl.se official documentation
libcurl API reference
Everything curl (official book)
Community Links
curl GitHub repository
StackOverflow curl tag
Linux & DevOps communities
Network engineering subforums
API developer forums
Community Support
curl’s GitHub repo
Stack Overflow
Networking forums
Linux communities
API developer communities
Frequently Asked Questions about Curl
What is Curl?
cURL is a command-line tool and library for transferring data with URLs. It supports a vast range of protocols (HTTP, HTTPS, FTP, SMTP, SFTP, etc.) and is widely used for API testing, automation, network debugging, and data transfers.
What are the primary use cases for Curl?
Calling REST APIs. Downloading or uploading files. Testing authentication flows. Debugging servers with verbose network logs. Automating data transfers
What are the strengths of Curl?
Massive protocol support. Perfect for API testing. Works everywhere (Linux, macOS, Windows). Reliable and stable for decades. Zero dependencies for most OS installs
What are the limitations of Curl?
Verbose syntax for complex operations. Not a programming language. Hard to read multi-flag commands. Limited JSON parsing (needs jq). Not ideal for browser-style sessions
How can I practice Curl typing speed?
CodeSpeedTest offers 10+ real Curl code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.