HTTP Request Checker
Fetch a URL from your browser and inspect the status and headers. Subject to CORS: targets that do not allow cross-origin reads cannot be inspected.
How to use
Enter a URL, choose GET or HEAD, and press Send request. Your browser fetches the URL and the page shows the status, the final URL after redirects, the elapsed time and every response header the browser is allowed to read. A missing scheme is filled in as https://. Requests time out after 20 seconds.
Notes
This tool runs entirely in your browser and uses no proxy. If a site does not allow CORS (Access-Control-Allow-Origin), the browser blocks reading the response even when the server answered fine, and the check reports a failure. That is browser security working as designed, not a bug. To inspect arbitrary servers reliably, use a command-line tool such as curl -I.
FAQ
Why does example.com work but my site fails?
Usually CORS: unless the target returns Access-Control-Allow-Origin, the browser refuses to expose the response. It says nothing about whether the server is up.
Why do I only see a few headers?
Cross-origin responses only expose a small standard set of headers unless the server opts in with Access-Control-Expose-Headers.