Web

HTTP Header Checker

Response Headers

HTTP header analyzer

Enter a website URL to analyze HTTP response headers, security settings, and performance configurations.

Tool features

Comprehensive HTTP header analysis with security and performance insights
4 checks

HTTP Header Analysis

Comprehensive analysis of HTTP response headers and security settings

Security Assessment

Evaluate security headers like HSTS, CSP, X-Frame-Options

Performance Headers

Check caching, compression, and performance optimization headers

Server Information

Identify server technology, version, and configuration details

What are HTTP response headers & how they work

Security, caching, and performance metadata behind every page

HTTP response headers are the metadata a server sends alongside every page. They control caching, compression, content type, cookies, and — critically — the security policies that protect your visitors. Inspecting them reveals how a site is configured and where it can be hardened or sped up.

This analyzer fetches a URL and lists every response header the server returns, grouped into security, performance, caching, and server-information categories. It flags missing security headers such as HSTS, CSP, and X-Frame-Options, and highlights caching directives that affect load time — giving you a complete picture in one request.

Security headers
Directives like Strict-Transport-Security, Content-Security-Policy, and X-Frame-Options that defend against common web attacks.
Cache-Control
Tells browsers and CDNs how long to store a response. Correct caching is one of the biggest performance wins.
Server header
Reveals the web server software and sometimes its version. Many teams minimise it to reduce information disclosure.

How to use this tool

Analyze a site's HTTP headers in four steps
1
Enter a website URL
Type the full URL you want to inspect, for example https://example.com.
2
Analyze the headers
We send a request and capture every HTTP response header the server returns.
3
Review by category
See security, performance, caching, and server headers, with missing ones flagged.
4
Apply the recommendations
Add missing security headers and tune caching in your server or CDN configuration.

Related tools

Keep debugging with tools from the same suite
5 tools
Secure Header Checker
Check security headers like CSP, HSTS, X-Frame-Options, and more with security scoring
HSTS Checker
Check HTTP Strict Transport Security (HSTS) header configuration and preload status
OCSP Checker
Check SSL certificate revocation status using the Online Certificate Status Protocol (OCSP)
HTTP Status Checker
Check HTTP status codes and response details for any URL with detailed analysis
HTTP/3 Test
Check if H3/QUIC is enabled on your website. Test HTTP/3 support and analyze Alt-Svc headers

Frequently asked questions

Common questions about HTTP header analysis
8 Q&A

An HTTP Header Checker analyzes all HTTP response headers a website returns. It inspects security headers, performance and caching headers, server information, and content-type headers so you can understand and optimise your site's responses.

Headers carry crucial information about security policies, caching strategy, server configuration, and performance. Checking them helps you spot security gaps, improve speed, and understand how your server responds to requests.

It checks all response headers including security headers (HSTS, CSP, X-Frame-Options), performance headers (Cache-Control, ETag), CORS headers, server information, and content-type headers — a comprehensive view of everything your server sends.

Yes. The tool is completely free for everyone to use.

No. The tool analyzes and displays the headers. You need to configure your server, web application, or hosting provider to add or modify headers based on the recommendations.

Yes. You can analyze HTTP headers for any publicly accessible website by entering its URL or domain name.

This HTTP Header Checker analyzes all HTTP headers (security, performance, caching, server info), while a Security Header Checker focuses specifically on security headers. For detailed security-header analysis, use our Security Header Checker.

You can export the header data, view detailed analysis, and use the recommendations to configure your server. The tool also links to specialised checkers like the HSTS Checker and CSP Checker for deeper analysis.