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 server refuses to process a request that might be replayed, typically 0-RTT TLS data.
When to use
TLS 1.3 early data rejection. The client should retry with 1-RTT.
Don’t
Not for “try again later” rate limits — that is 429.
Live URL
curl -i https://corecoding.com/utilities/http-status.php?code=425
No codes match.
Code use cases