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 got an empty, invalid, or unexplained response from the origin.
When to use
Debugging Cloudflare → origin. Check origin logs, TLS, and sudden disconnects.
Don’t
Fix origin 5xx; do not emit 520 yourself.
Live URL
curl -i https://corecoding.com/utilities/http-status.php?code=520
No codes match.
Code use cases