Free HTTP Header Checker
Inspect HTTP response headers, status codes, redirect chains, cache directives, security headers and SEO-related server signals for any public URL.
Analyze HTTP Response Headers
Enter a public URL to inspect its server response
Response Summary
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HTTP Response Headers
Headers returned by the final response
| Header | Value | Action |
|---|
Run a check to analyze security headers.
Run a check to analyze SEO-related headers.
Redirect Chain
HTTP hops before the final response
Ready to Inspect Headers
Enter a public website URL above to analyze HTTP status codes, response headers, security directives, caching behavior and redirect hops.
Response Headers
Inspect HTTP headers returned by the target server.
Security Audit
Review common browser security response headers.
SEO Signals
Check status, robots directives, content type and redirects.
Redirect Chain
Review redirect hops before reaching the final URL.
Simple Process
How to Check HTTP Headers
Inspect a website response in three simple steps.
Enter a URL
Paste the full public HTTP or HTTPS address you want to inspect.
Run the Check
Choose request options and retrieve the server response.
Review Results
Analyze headers, security, SEO signals and redirect hops.
HTTP Response Guide
What Is an HTTP Header Checker?
An HTTP Header Checker retrieves the response metadata returned by a web server when a URL is requested. These headers can describe content type, caching behavior, redirects, browser security policies, indexing directives and other properties of the response.
Reviewing response headers can help developers, technical SEO professionals and website administrators troubleshoot status codes, inspect redirect behavior, identify caching rules and review server configuration.
Example HTTP Response Headers
HTTP/2 200 OK content-type: text/html; charset=utf-8 cache-control: public, max-age=3600 content-security-policy: default-src 'self' strict-transport-security: max-age=31536000 x-content-type-options: nosniff
Why Check HTTP Response Headers?
HTTP headers provide information that may not be visible in the rendered webpage. A page can appear normal in a browser while still returning an unexpected status code, restrictive robots directive, incorrect content type, weak cache configuration or redirect response.
Technical SEO
Review status codes, redirects, X-Robots-Tag and response behavior.
Security Review
Inspect common browser security response headers.
Cache Debugging
Review Cache-Control, Expires, ETag and related directives.
Redirect Testing
Inspect status codes and destination hops in redirect chains.
Important HTTP Headers to Review
| Header | Common Purpose |
|---|---|
| Content-Type | Describes the media type of the response. |
| Cache-Control | Defines caching behavior for browsers and intermediaries. |
| Location | Commonly identifies the destination of a redirect response. |
| X-Robots-Tag | Can communicate crawler indexing directives. |
| Content-Security-Policy | Defines browser content loading restrictions. |
| Strict-Transport-Security | Communicates HTTPS-only transport policy to browsers. |
HTTP Status Codes and SEO
The response status code is one of the most important server signals to inspect. A successful page commonly returns a 2xx response, redirects use 3xx responses, client errors use 4xx responses and server errors use 5xx responses.
Security Headers
Security-related response headers can instruct browsers how to handle transport security, content loading, framing, MIME type interpretation and referrer information. This tool checks for several commonly reviewed headers.
Common Security Headers
Cache Headers
Cache-related headers can influence how browsers, proxies and content delivery systems reuse responses. Common headers include Cache-Control, Expires, ETag, Last-Modified, Age and Vary.
Important Technical Note
A browser-only frontend cannot reliably inspect arbitrary third-party response headers because cross-origin access is restricted. A production HTTP Header Checker should use a secure server-side endpoint that validates URLs, blocks private network targets, limits redirects and applies request timeouts.
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Open Tool →FAQ
HTTP Header Checker FAQs
Check Website HTTP Headers
Inspect status codes, response headers, security directives, redirects and SEO-related signals.
Check Headers →