API Testing FAQ
Common questions and concise answers for faster online API debugging.
Common questions
What is the fastest way to test an API online?
Use a browser-based HTTP request tool: method, URL, headers/body, then inspect status and response.
Why do I get 401 or 403?
Usually token or permission scope mismatch. Verify auth token freshness and endpoint permissions.
How do I debug timeout errors?
Check network path and upstream latency, then adjust timeout and retry policy for safe requests.
What should I check for 400 errors?
Validate request body shape, required fields, and `Content-Type` header alignment.
Start in 30 seconds
- Open the online request tool and choose an HTTP method.
- Paste endpoint URL, then add headers/body if required.
- Send request and inspect status, headers, and response body.