HTTP Header Checker
Inspect the raw HTTP response of any URL. See the status code, each redirect hop, response time, and every response header — caching, compression, security, CORS, cookies and CDN headers — with a plain-English explanation of what each one does.
Enter a URL and our server requests it like a browser, follows redirects and returns the complete list of response headers from the final page, including Set-Cookie. Each common header is explained, and you can copy them all in raw format for bug reports.
Instant Results
Live checks in seconds
Nothing Stored
No logs of what you check
No Sign-Up
Free, no credits or email
Suggest a Feature or Improvement for HTTP Header Checker
Need custom options, higher limits, or extra format support? Let our engineering team know!
How to use HTTP Header Checker
- 1Enter the URL.
- 2Check the redirect chain and status code.
- 3Read the headers and their explanations.
- 4Copy the raw headers if you need them.
What headers tell you
Cache-Control, ETag and Age show how the page is cached by browsers and CDNs. Content-Encoding shows compression (br or gzip). Server and cf-cache-status reveal the stack and CDN. Location reveals redirects. Security headers and Set-Cookie flags show how well visitors are protected.
Checking headers is the fastest way to debug caching problems, redirect loops, CORS errors and missing compression.
Related checks
Grade the security headers with the Security Headers Checker, test many URLs' status codes at once with the HTTP Status Checker, and audit cookie flags with the Cookie Security Checker.
Frequently Asked Questions
Why do I see different headers in my browser?
Servers can vary headers by location, cookies, user agent and compression support, and your browser may be seeing a cached copy.
What do you do with the domains and URLs I check?
Our server performs the lookup once and returns the result to your browser. We don't store the addresses you check or build a history. Private and internal addresses are blocked.
Is it free? Do I need an account?
It's completely free with no sign-up and no daily credits.
Guides & Tutorials
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