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?
This server, as gateway or proxy, did not get a timely response from upstream.
When to use
Origin too slow, database behind a proxy that gave up.
Don’t
The client being slow to send is 408. Your handler crashing is 500.
Live URL
curl -i https://corecoding.com/utilities/http-status.php?code=504
No codes match.
Code use cases