With the fundamentals in place, it is time to send a real request. Postman is the ideal tool for this first hands-on step, and the process is quick.
Step by step
- Open Postman and create a new request.
- Choose the method (start with GET).
- Enter the URL of a public test API endpoint.
- Click Send.
- Inspect the response: status code, time, size, and body.
Your first Postman call
Pick method + URL
→
Send
→
Read status + body
What to look at in the response
- Status code — did it succeed (200)?
- Body — is the returned JSON what you expected?
- Headers — content type and other metadata.
- Time — how long the call took.
Try next: change the URL to an invalid resource and watch the status code change to 404 — your first taste of negative testing.
Conclusion
Sending your first Postman request turns theory into practice: you choose a method and URL, send it, and read the response. From here, every richer feature — collections, variables, assertions — builds on this simple loop.