HTTP Headers Checker
Analyze HTTP headers of any URL instantly. Status code, response time and full security headers analysis. No sign-up.
Built by
Miguel Ángel Colorado Marin (MACM)
Built by
Miguel Ángel Colorado Marin (MACM)
Full-Stack Developer · Guadalajara, España
I develop web apps, digital tools and full projects — from design to deployment.
How to use the HTTP headers checker?
- 1
Enter the URL
Type or paste the full URL of the site you want to analyze. You can include or omit the https:// protocol — the tool adds it automatically if missing.
- 2
Click Check
Click the Check button or press Enter. The tool sends a HEAD request to the server and receives the HTTP response headers without downloading the page content.
- 3
Review the status code and response time
You'll see the HTTP code (200 OK, 301 Redirect, 404 Not Found…) and response time in milliseconds. This information helps detect unexpected redirects or high latency.
- 4
Analyze the security headers
The security section shows which critical headers your site has (HSTS, CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy) and which are missing, with their function explained.
Important security headers
These 6 HTTP headers are essential for the security of any website. If any is missing from your domain, it could be exploited by attackers.
Strict-Transport-Security (HSTS)
Forces the browser to always use HTTPS with your domain. Prevents downgrade attacks where an attacker forces an unencrypted HTTP connection.
Content-Security-Policy (CSP)
Defines what resources your page can load. Protects against XSS attacks by limiting which scripts, styles and iframes are allowed.
X-Frame-Options
Controls whether your page can be embedded in an iframe. Protects against clickjacking, where a malicious page overlays your site invisibly.
X-Content-Type-Options
Prevents the browser from interpreting files with a different MIME type than declared. Prevents MIME sniffing attacks.
Referrer-Policy
Controls what referrer information is sent when the user navigates to another site. Protects your users' privacy.
Permissions-Policy
Controls which browser APIs (camera, microphone, geolocation) your page can use. Reduces attack surface and protects privacy.
Frequently asked questions
What are HTTP headers?
HTTP headers are metadata that the server sends along with the response. They include information about content type, cache, cookies, redirects, security control and much more. Not visible in the page but essential for how the web works correctly.
What is HSTS and why is it important?
HSTS (HTTP Strict Transport Security) is a security header that forces the browser to always use HTTPS with that domain. It prevents downgrade and man-in-the-middle attacks. Configured with: Strict-Transport-Security: max-age=31536000; includeSubDomains.
What is CSP and how does it protect my site?
CSP (Content Security Policy) is a header that defines what resources a web page can load. It allows you to specify which scripts, styles, images and fonts are trusted, drastically reducing the risk of XSS (Cross-Site Scripting) attacks.
Why are security headers missing from my site?
Most web servers don't include security headers by default. You must configure them manually in your web server (Apache, Nginx), your CDN (Cloudflare, Vercel) or directly in your application. Each missing header is a potential security vulnerability.
Is the analyzed data stored?
No. The tool sends a HEAD request to the target server from our server and returns the headers to you. We don't store any data, search history or results anywhere.
Embed this tool
You can integrate this HTTP headers checker in your blog or website by copying the following iframe:
<iframe src="https://miguelacm.es/embed/http-headers" width="100%" height="600" style="border:none;border-radius:12px;" loading="lazy"></iframe>
Want to see how it's made? The source code is available on GitHub.
View on GitHub