What is cURL

cURL is a tool that lets you talk to servers from the terminal.

Think of it like:

• Browser talks to server using clicks

• cURL talks to server using commands

—cURL sends requests
—Server sends responses

That’s it.

Why programmers need cURL

Programmers use cURL to:

• Test APIs

• Fetch data from servers

• Send data to servers

• Debug backend issues

• Work without a browser

If you work with backend, APIs, DevOps, cybersecurity, or web dev — cURL is unavoidable.

Your first cURL request

Let’s fetch a webpage.

curl https://example.com

What just happened?

• You asked the server: “Give me this page”

• The server replied with HTML

• cURL printed that response in the terminal

You just talked to a server

Understanding request and response

Request (what you send)

• URL

• Method (GET / POST)

• Optional data

Response (what you get back)

• Status (was it successful?)

• Data (HTML, JSON, text, etc.)

Example response meaning:

• 200 OK → Success

• 404 → Not found

• 500 → Server error

  Using cURL to talk to APIs

  APIs are just servers that:

  • don’t send web pages

  • send data (usually JSON)

Example:

    curl https://api.github.com/users/octocat

Response = structured data
Perfect for:

• apps

• automation

• testing

Conclusion

cURL is a command-line tool that lets you send messages to servers and see their replies.

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