Look up a status, pick the right one for an API, or hit a live endpoint that actually returns it. Add ?code=418 to this URL and the response is that status — useful for curl, interceptors, and “what does my client do on 503?” Nothing here phones home except the Try it fetch to this same page.
Which class?
The request conflicts with the current state of the resource.
When to use
Edit conflicts, duplicate unique keys, “already processed” on an idempotent-looking POST.
Don’t
Validation of a single field is usually 400/422. Missing resource is 404.
Live URL
curl -i https://corecoding.com/utilities/http-status.php?code=409
No codes match.
Code use cases