Getting Started with cURL
What is cURL?
cURL is a tool that lets you send request to a server from the terminal.
Think of cURL as:
A way to say, “Hey server, here’s a request” and see the reply.
Instead of clicking buttons in a browser, you type a command.
cURL:
Runs in the terminal
Talks directly to servers
Shows raw responses
It’s like using the command line as a browser, but more honest and transparent.
Why programmers need cURL
Programmers use cURL because it:
Helps test APIs quickly
Works without a browser
Shows exactly what the server returns
Is available on almost every system
If you work with:
Backend services
APIs
Microservices
Debugging network issues
cURL becomes an everyday tool.
Your first cURL command
Let’s make the simplest possible request.
curl https://google.com
That’s it.
What just happened?
cURL sent a request to
google.comThe server responded with data
cURL printed that data in your terminal
You just fetched a webpage without a browser.
Understanding Request and Response
Every interaction with a server has two parts:
1. The Request
This is what you send.
It includes:
Where you’re sending it (URL)
What you want to do (GET or POST)
2. The Response
This is what comes back.
It includes:
A status (did it work or not?)
Data (HTML, JSON, text, etc.)
cURL shows you the response directly, which is great for learning.
GET Requests (Asking for Data)
By default, cURL makes a GET request.
GET means:
“Please give me this information.”
Example:
curl https://api.github.com
The server replies with data (usually JSON). Most read-only actions use GET.
POST Requests (Sending Data)
A POST request means:
“Here is some data. Please process it.”
POST is commonly used for:
Submitting forms
Creating new data
Logging in
For now, just remember:
GET = receive data
POST = send data
No need to memorize flags yet.
Using cURL to talk to APIs
APIs are servers designed to talk to programs instead of humans. cURL is perfect for this.
Example:
curl https://api.github.com/users/octocat
You’ll receive structured data instead of a webpage.
This helps you:
Understand API responses
Test endpoints
Debug issues quickly
Common Beginner Mistakes
1. Expecting a Pretty Page
cURL shows raw data, not styled webpages. That’s normal.
2. Forgetting HTTPS
Many servers reject plain HTTP. Always try https:// first.
3. Thinking cURL Is Only for Experts
It’s not. If you can copy-paste a command, you can use cURL.
4. Using Too Many Flags Too Early
You don’t need advanced options at the start. Focus on understanding requests and responses first.
How cURL fits into backend development
In backend work, cURL is often used to:
Test APIs before writing code
Debug failing requests
Check server responses quickly
Reproduce bugs
cURL → Server → Response
Browser does the same thing. cURL just lets you see it more clearly.
To Sum Up:
cURL is not about memorizing commands.
It’s about understanding one simple idea:
“Send a request. Get a response.”
Once that makes sense, everything else builds naturally.
