ZenovayTools

HTTP Header Checker

Inspect HTTP response headers of any URL. Check security headers, caching, content type, and more.

How to Use HTTP Header Checker

  1. 1Enter the URL whose HTTP headers you want to inspect.
  2. 2Click "Check Headers" to send a request and retrieve the response.
  3. 3Review all HTTP response headers including security, caching, and content type.
  4. 4Check for missing security headers and follow the recommendations.
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Frequently Asked Questions

What are HTTP response headers?▾
HTTP response headers are metadata sent by the server along with a response. They provide information about the server, content type, caching, security policies, and more.
Which security headers should my site have?▾
Key security headers include Strict-Transport-Security (HSTS), Content-Security-Policy (CSP), X-Content-Type-Options, X-Frame-Options, Referrer-Policy, and Permissions-Policy.
What is a good security header score?▾
A score of 80%+ means your site has most important security headers. 100% means all standard security headers are present. Even with all headers, make sure the values are properly configured.
Does this tool make a GET or HEAD request?▾
This tool makes a HEAD request, which returns only the headers without the full page body. This is faster and uses less bandwidth.
How does this tool fetch headers?▾
Our servers send an HTTP HEAD request to the URL you provide and capture the response headers. This server-side approach shows the same headers that browsers and search engines see.
What is Content-Security-Policy (CSP)?▾
CSP is a security header that tells browsers which sources of content (scripts, styles, images) are trusted. It helps prevent cross-site scripting (XSS) attacks by blocking unauthorized scripts.
Can I check headers for private or internal sites?▾
No. The tool can only check publicly accessible URLs. Internal, localhost, or private network domains cannot be reached by our servers.