CORS check optional

Asks the final address whether a script on that origin may call it, the way a browser does: with a preflight first when the request needs one. One address only.

To check a list, paste up to 50 addresses, one per line; Shift+Enter adds a line. Each follows up to 10 redirects in 15 seconds.

Where does this address lead?

See every response on the way to the final page, with its status, headers, and timing. Paste a list to check up to 50 addresses at once.