Network ToolsHTTP Header Checker
Free HTTP Header Checker

HTTP Header Checker

Fetch any URL and inspect its response headers, status code, and server metadata so you can understand caching, security policies, redirects, and content handling more clearly.

Status code visibilitySecurity header checksCache behavior cluesRedirect troubleshootingFree inspection tool
Quick checks

Inspect headers without opening developer tools.

Security context

Review headers that affect browser protection.

Useful for debugging

Helpful for redirects, caching, and server setup.

HTTP Header Checker
Inspect response headers from any URL
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What this HTTP header checker shows

This tool helps you inspect server response headers for a URL so you can better understand how that page is served and what browser instructions it includes.

That makes it useful for developers, SEO teams, support teams, security reviews, and anyone investigating server behavior or caching issues.

Why it matters

Headers often explain why content is cached, redirected, blocked, or protected — which makes them incredibly useful for troubleshooting.

What are HTTP headers?

HTTP headers are key-value pairs sent between client and server with every request and response. Response headers tell the client how to handle the content — whether to cache it, how long for, what content type it is, and whether security policies apply.

Common headers include content-type, cache-control, strict-transport-security, and content-security-policy.

Security headers to check

Good security headers protect your visitors. Strict-Transport-Security forces HTTPS. X-Frame-Options prevents clickjacking. Content-Security-Policy restricts which resources the browser can load.

Understanding HTTP status codes

  • 2xx (Success) — request succeeded.
  • 3xx (Redirect) — the request requires further action.
  • 4xx (Client Error) — the request is malformed or not found.
  • 5xx (Server Error) — the server failed to fulfill the request.

Essential response headers explained

content-type

Specifies the media type of the response.

cache-control

Tells browsers and CDNs how long to cache the response.

content-length

The size of the response body in bytes.

last-modified

The date and time the resource was last changed.

etag

A unique identifier for a specific version of the resource.

strict-transport-security

Forces future connections to use HTTPS.

Why inspect HTTP headers?

  • Debugging — identify why a site isn't loading, caching, or behaving as expected.
  • Security audit — verify essential security headers.
  • Performance optimization — check cache headers.
  • Redirect tracking — see redirect behavior.
  • SEO analysis — verify server behavior that affects crawlers.

Frequently asked questions

What's the difference between request and response headers?

Request headers are sent by the client, while response headers are sent back by the server. This tool checks response headers.

Why can I get a timeout?

The host may be slow, offline, or blocking the request from an automated environment.

Can I see custom headers?

Yes. If the server returns custom headers, this tool will include them in the response header list.

What should I use next?

Ping, DNS, and website intelligence tools can help if you need more context around reachability or server setup.

Ping TestDNS LookupWebsite Intelligence