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 client has been rate limited. Include Retry-After when you can.
When to use
Per-user or per-IP throttles, quota exhaustion.
Don’t
The whole service being down is 503. Do not use 420 (Twitter’s old unofficial code).
Live URL
curl -i https://corecoding.com/utilities/http-status.php?code=429
No codes match.
Code use cases