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?
Cloudflare TCP-connected to origin but the handshake or response did not finish in time.
When to use
Firewall dropping packets, origin overloaded, missing allowlist of Cloudflare IPs.
Don’t
A completed HTTP timeout from a proxy is usually 504.
Live URL
curl -i https://corecoding.com/utilities/http-status.php?code=522
No codes match.
Code use cases