HTTP Headers Checker — Inspect Response Headers

Website URL

Share X / Twitter Facebook LinkedIn WhatsApp

How to use HTTP Headers Checker

Enter the URL.
Read the headers — status, caching, security, content type, redirects.
Audit by concern: status correctness, Cache-Control presence, and the security-header set.
Fix at the server/CDN and re-check — headers are configuration, changeable without touching content.

What is HTTP Headers Checker?

An HTTP headers checker shows the metadata a server returns with a response — everything before the page content: the status code (200, 301, 404, 500), caching directives, content type, redirect targets, security headers (HSTS, CSP, X-Frame-Options), and server hints. It's the response's label, normally invisible.

Headers control behavior the body never shows: whether browsers cache the page, enforce HTTPS, allow framing, or block mixed content. Debugging, security auditing and SEO checks all live in these lines.

About the HTTP Headers Checker

Enter a URL and read its full response headers.

The inspections that matter: status verification — is a redirect a 301 (permanent, SEO-value-passing) or 302 (temporary)? does a "deleted" page correctly return 404/410 or wrongly 200? (our Redirect Checker traces full chains; this shows one response in detail); caching audit — Cache-Control and Expires decide whether assets cache (missing headers mean every visit re-downloads everything — a silent speed leak); security header check — HSTS (force HTTPS), CSP (script control), X-Frame-Options (clickjacking defense), X-Content-Type-Options; their absence is the most common finding in a security audit; and server fingerprinting — the Server header naming the stack (informative, and a reason many hide it).

Uses: post-deploy verification (did the CDN/cache/security config actually apply?), diagnosing "why won't this cache / why the mixed-content warning / why can't I iframe this", and SEO technical audits. Chain onward to the SSL checker for the certificate layer.

Frequently Asked Questions

Strict-Transport-Security (HSTS — forces HTTPS), Content-Security-Policy (controls what scripts/resources load — the strongest XSS defense), X-Frame-Options (blocks clickjacking), and X-Content-Type-Options: nosniff. Their absence is the top finding in most header audits.

Cache-Control and Expires tell browsers/CDNs how long to reuse a file. Missing or no-cache on static assets means re-downloading everything each visit — a common, invisible performance drain fixed purely in config.

The status code: 301 (permanent) passes ranking signals; 302 (temporary) tells Google to keep the old URL. This shows one response's code; for multi-hop chains use the Redirect Checker.

It's minor hardening — obscuring the stack/version slightly slows targeted attacks (security-by-obscurity, not a real defense). Worth doing as part of a broader hardening pass, not on its own.

A "soft 404" — the CMS serves a not-found PAGE with a 200 OK status, confusing crawlers into indexing empty pages. Genuine missing content must return an actual 404/410 status, which this checker confirms.