What are security headers?

Security headers are HTTP response headers that instruct browsers to enable built-in security protections. Key headers include Strict-Transport-Security (HSTS), Content-Security-Policy (CSP), X-Frame-Options, and X-Content-Type-Options. They protect against clickjacking, XSS, MIME sniffing, and mixed content attacks.

What is HSTS and why is it important?

HSTS (HTTP Strict Transport Security) tells browsers to always use HTTPS for your domain, preventing downgrade attacks where attackers force an HTTPS connection back to HTTP. Without HSTS, users who type http:// are vulnerable to interception.

What is CORS and why does it matter?

CORS (Cross-Origin Resource Sharing) controls which domains can make requests to your server. Misconfigured CORS headers cause frontend JavaScript errors when APIs are called from different domains. The tool helps you verify Access-Control-Allow-Origin settings.

What is Content-Security-Policy?

Content-Security-Policy (CSP) controls which resources (scripts, styles, images) the browser is allowed to load for your page. A strong CSP prevents XSS attacks by blocking inline scripts and restricting resource sources to trusted domains.

Can I check headers for any website?

Yes. The tool works for any publicly accessible URL. You do not need to own or administer the website to check its HTTP headers. This is useful for auditing competitor configurations or verifying third-party service headers.

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HTTP Headers Analyzer

An HTTP headers analyzer is a free online tool that retrieves and analyzes HTTP response headers for any URL. It checks security headers (HSTS, CSP, X-Frame-Options), CORS configuration, and caching settings—no signup required.

100% FreeNo Signup RequiredBrowser-BasedPrivate & Secure

What is HTTP Headers Analyzer?

An HTTP headers analyzer is an online tool that retrieves and displays HTTP response headers for a URL, analyzing security configurations, CORS policies, and caching behavior. It identifies missing security headers and provides remediation guidance.

Complementary Tools

These tools work great alongside HTTP Headers Analyzer:

SSL Certificate Checker DNS Lookup

Start Using HTTP Headers Analyzer Today

The HTTP Headers Analyzer gives you a complete picture of how any web server communicates with browsers. Enter a URL, analyze the headers, and identify missing security configurations, CORS issues, and caching problems—no signup, no waiting. Whether you are hardening security headers or debugging cross-origin requests, the tool delivers instant, actionable insights.

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