HTTP Header Checker
Inspect HTTP response headers for any URL
HTTP Header Checker sends a real request to a URL you give it and shows the exact status code and every response header that came back — useful for confirming caching, security or redirect headers are actually set the way you expect, without opening developer tools yourself.
How to use HTTP Header Checker
- 1
Enter the URL you want to inspect.
- 2
Click "Check Headers" to fetch it.
- 3
Review the status code returned.
- 4
Scan the full list of response headers.
Everything you need to know about HTTP headers
What are HTTP headers?
HTTP headers are metadata sent alongside a page's actual content — status codes, caching rules, security policies, server information — invisible in the browser itself but important for debugging performance, security, and SEO issues.
When you actually need this
- Debugging unexpected caching behavior — a page not updating after a deploy is often a caching header issue.
- Checking security headers are actually being sent (HSTS, Content-Security-Policy, etc.).
- Confirming a redirect or status code is what you expect it to be.
Related check: redirects specifically
If the specific thing you're debugging is a redirect chain rather than headers generally, Redirect Checker traces the full hop-by-hop path a URL takes.
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Frequently Asked Questions
Can I check any URL, including internal or private addresses?
No — only public, routable addresses are allowed. Private and internal IP ranges are rejected before any request is made, which prevents this tool from being used to probe internal network addresses.
What headers are commonly worth checking?
content-encoding (confirms compression is working), cache-control (confirms caching behavior), and security headers like strict-transport-security — all directly visible in the results here.
What's the difference between this and the Redirect Checker?
This shows one request's full headers. Redirect Checker follows a chain of redirects and reports the status at each hop plus the final destination — use that when a URL might not go straight to its target.
Does this tool send the URL to a server?
Yes — the request is made from our servers, which is what lets it check headers that a browser's own CORS restrictions would otherwise hide.
Is this tool free to use?
Yes — completely free, with no signup and no usage limits for casual use.