Inspect public response headers without downloading large pages.
Only the domain or URL you enter is sent to Duck Cloud’s lookup service. Duck Cloud does not need your account or uploaded files.
About this HTTP Header Checker tool
HTTP Header Checker performs a time-limited remote lookup through Duck Cloud’s Cloudflare Worker. Only the submitted domain or URL is sent; results are not saved.
How to use it
1Paste or type your input in the tool.
2Select the action button or use the displayed keyboard shortcut.
3Review the result, then copy it or clear the tool.
Example
Use the sample already provided in HTTP Header Checker, or replace it with your own input.