Check your headers

See what reaches this Cloudflare Worker and what your browser receives back.

In ChHeader, allow this hostname.
Add request header X-ChHeader-Test: hello-gecko and response header X-ChHeader-Response: modified.
Choose URL pattern and enter /headers/match. Turn the profile on and approve access. Reopen ChHeader, select that profile and enable it again if needed.
Reload both test pages after changing access, then run the checks. The matching path should change; the other path and redirect should stay unchanged.

For cross-site checks, approve this page and the second test site. Add a matching URL rule for the second site too.

No checks run yet.

Results appear here.

Use demo values only. This page displays Accept, Content-Type, X-Env and X-ChHeader-Test. Other headers are omitted, including authorization and cookies. Requests still reach Cloudflare; use a local tester for secrets. This Worker has no application logs, analytics or storage.

“Request headers” come from the Worker. “Response header” comes from your browser. A missing value means the rule did not apply; this page never sets the test headers itself.