Use our free HTTP Header Checker to inspect the raw response headers of any public website instantly. Since browsers block cross-origin requests, our tool safely fetches the target URL server-side to analyze security headers, caching rules, and server status codes. Furthermore, we do not log or store any data you check.
We do not log or store the URLs you check.
the URL you enter, via our server (your browser cannot read another site's response headers directly)
Fetching headers…
Why Should You Check HTTP Response Headers?
Every time your browser requests a webpage, the web server sends back hidden metadata alongside the main HTML content. These headers determine how browsers cache your pages, manage security policies, and handle cookies.
Therefore, developers and site owners regularly use an HTTP header checker to verify their site settings. For instance, checking headers ensures that security policies like Content-Security-Policy and Strict-Transport-Security work correctly across your entire domain.
How This HTTP Header Checker Tool Works
Modern web browsers enforce strict Same-Origin and Cross-Origin Resource Sharing (CORS) rules. Because a browser cannot directly read another domain’s response headers, our tool handles the request securely behind the scenes:
- Server-Side Fetching: Our secure server issues a direct web request to the public URL you provide.
- Header Extraction: The tool captures every HTTP response header returned by the target host in its original order.
- Formatted Display: Headers like Cache-Control, Server, Content-Type, and HTTP status codes are organized clearly for easy review.
Key Security Headers to Audit
According to web security guidelines published on the MDN Web Docs HTTP Headers Guide, configuring strong security headers safeguards your users from cross-site scripting (XSS) and clickjacking attacks:
- Strict-Transport-Security (HSTS): Enforces encrypted HTTPS connections between browsers and your server.
- X-Frame-Options: Prevents unauthorized framing to protect your site against clickjacking.
- Content-Security-Policy (CSP): Controls which external resources (scripts, styles, images) are allowed to execute on your page.
FAQ
Why does this tool fetch URLs from your server instead of my browser?
Browser CORS policies prevent web pages from reading raw headers sent by third-party domains. Running the request from our server allows us to read the complete HTTP response without cross-origin limitations.
Can I test local or internal network addresses?
No. To maintain security, this utility only inspects publicly accessible web URLs. Requests directed toward localhost, private IP ranges (like 192.168.x.x), or internal endpoints are automatically blocked.
Do you log or retain the URLs tested on VedantKit?
No. We do not store, log, or track any URLs or headers processed using VedantKit tools.