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HTTP Header Checker

Inspect every HTTP response header a URL sends — caching, security, cookies, CDN and more.

URL

We fetch the URL and list all response headers.

About the HTTP Header Checker

HTTP headers are the metadata a server sends with every response — controlling caching, security, compression, cookies and CDN behaviour. This tool lists them all so you can audit configuration at a glance.

What this tool checks

Every response header the server returns
Caching, security and CDN headers
Status code, HTTP version and response time

HTTP status codes at a glance

Code	Meaning	What it tells you
200	OK	The page loaded normally.
301	Moved Permanently	Permanent redirect — passes ranking signals.
302 / 307	Found / Temporary Redirect	Temporary redirect — keep the original URL.
304	Not Modified	Cached copy is still fresh.
401 / 403	Unauthorized / Forbidden	Access is blocked (auth or permissions).
404	Not Found	The URL doesn't exist — fix or redirect it.
410	Gone	Permanently removed on purpose.
429	Too Many Requests	Rate-limited — slow down.
500 / 502 / 503	Server errors	The server failed — a red flag for SEO and users.

Frequently asked questions

Which headers matter most for SEO?

Cache-Control (speed), Content-Type, X-Robots-Tag (indexing) and the security headers all influence how crawlers and users experience the page.

Why do I see a Cloudflare or CDN header?

The site sits behind a CDN, which adds its own headers and serves cached copies from the edge.