Fetch the URL server-side and inspect the response.
How your data is handled:
Pasted JSON is parsed entirely in your browser — it is never sent to any server.
URL fetches are performed by the server (this Worker) and the result is returned to your browser.
The server does not store, log, or share URLs or response bodies.
Note: Hosts that are themselves behind Cloudflare cannot be reached from this server
(the platform refuses to open a connection back into its own network).
If a URL returns "unreachable" and you know the host is not behind Cloudflare,
the server may have been unable to resolve or connect for other reasons.