HTTP Headers Checker
View the HTTP headers returned by a URL.
Last reviewed by the Radiatus Cloud team
HTTP Headers Checker
View the HTTP response headers returned by a URL (Server-side check).
Need this handled by experts?
Radiatus runs VAPT, managed SOC & security engineering for regulated teams.
See the headers a URL returns
HTTP response headers reveal how a server is configured, from caching to security. This tool shows the HTTP headers returned by a URL, so you can inspect what a server sends and reason about its configuration.
Why the headers are worth reading
Response headers are the server’s side of the conversation, and they say a lot: which security protections are enabled, how caching is set, what server software is disclosed, how content types and redirects are handled. Reading them is how you diagnose why a page caches wrongly, confirm a security header is present, or notice that a server is leaking its software version. For anyone building or securing a site, the headers are a primary source of truth about how it actually behaves, as opposed to how you think it is configured.
Inspect the response
The tool runs entirely in your browser, so nothing you paste is uploaded, which is exactly what you want when the input is your own security-sensitive data.
Related tools
- Password Strength Checker — Measure password strength by entropy and pattern analysis rather than character-class rules. Checked entirely in your browser.
- Password Generator — Generate strong random passwords and passphrases in your browser using the Web Crypto API. Nothing is transmitted, logged or stored.
- Hash Generator — Generate MD5, SHA-1, SHA-256 and SHA-512 hashes in your browser. Compare checksums and verify file integrity with nothing uploaded to a server.
- Base64 Encoder/Decoder — Encode and decode Base64 in your browser, including URL-safe Base64 and UTF-8 text. Handles files and data URIs locally with nothing uploaded.
Frequently Asked Questions
What do HTTP response headers reveal?
How the server is configured: security protections, caching behaviour, disclosed software, content-type handling and redirects. They are the server’s side of the exchange.
Why check the headers of a URL?
To diagnose caching problems, confirm security headers are present, or notice information leaks like a disclosed software version.
What security headers should I look for?
Content-Security-Policy, Strict-Transport-Security, X-Content-Type-Options and framing headers, which enable browser protections when present.
Can headers leak information?
Yes. A header disclosing the exact server software and version helps an attacker target known vulnerabilities, so such disclosure is worth removing.
Is my input uploaded?
The checker inspects the headers for the URL you provide.
Privacy & Security
Server request.
About This Tool
This tool runs entirely in your browser. No data is sent to any server, ensuring complete privacy. Simply use the interface above to get started — no registration or login required.
Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.
Related Tools
Password Strength Checker
SecurityMeasure password strength by entropy and pattern analysis rather than character-class rules. Checked entirely in your browser.
Password Generator
SecurityGenerate strong random passwords and passphrases in your browser using the Web Crypto API. Nothing is transmitted, logged or stored.
Hash Generator
SecurityGenerate MD5, SHA-1, SHA-256 and SHA-512 hashes in your browser. Compare checksums and verify file integrity with nothing uploaded to a server.