Free HTTP Header Checker — Check Website HTTP Headers Online

An HTTP header checker retrieves and displays the HTTP response headers for any URL. Analyze security headers, caching policies, redirect chains, and server configurations to diagnose website performance and security issues.

Key Features

• Real-Time Header Inspection — Fetch and display all HTTP response headers for any URL
• Redirect Chain Tracing — Follow redirect chains and display every intermediate status code and URL
• Security Header Analysis — Highlight missing or misconfigured security headers
• Caching Policy Overview — Display Cache-Control, Expires, and ETag headers for cache analysis
• Server Information — Show server type, content encoding, and other infrastructure details
• Status Code Display — Clearly show the final HTTP status code (200, 301, 404, 500, etc.)
• One-Click Copy — Copy all headers or individual header values for documentation

What are HTTP Headers?

HTTP headers are the metadata components of HTTP request and response messages. When a browser requests a webpage, the server responds with both the content (HTML, images, etc.) and headers that describe how to handle that content. Headers control everything from security policies to caching behaviour to content negotiation. Checking these headers is one of the first diagnostic steps when troubleshooting website issues — whether the problem is security, performance, SEO, or functionality.

How to Use This HTTP Header Checker

Enter a URL in the input field and click Check. The tool fetches the URL and displays all response headers grouped by category — general headers, response headers, entity headers, and security headers. The redirect chain is shown if the URL redirects. Each security header is flagged as present or missing. Click any header to copy its value.

Common Use Cases

• SEO Professionals — Verify 301 redirects, check X-Robots-Tag directives, and confirm canonical header implementation
• Web Developers — Debug CORS issues, verify Content-Type headers, and check server configuration during deployment
• Security Auditors — Audit security header implementation (CSP, HSTS, X-Frame-Options) across websites
• Performance Engineers — Analyze Cache-Control and ETag headers to verify caching strategy effectiveness
• Site Migrators — Verify redirect chains during domain migrations, URL structure changes, and CMS migrations
• DevOps Teams — Confirm server headers after infrastructure changes, CDN configuration, or load balancer setup

Why HTTP Headers Matter

HTTP headers directly impact how browsers, search engines, and security tools interact with your website. Security headers like Content-Security-Policy prevent data theft and malware injection. Caching headers determine whether repeat visitors get fast cached pages or slow server-rendered pages. Redirect headers control how search engines transfer ranking authority when pages move. Server headers can reveal software versions that attackers might exploit. For Indian businesses managing customer-facing websites, proper HTTP header configuration is essential for security compliance (such as PCI DSS for e-commerce), SEO performance, and user experience. Regular header audits should be part of every website maintenance routine.

Common HTTP Status Codes

• 200 OK — Request succeeded, content returned normally
• 301 Moved Permanently — Page has permanently moved to a new URL (redirect)
• 302 Found — Page has temporarily moved (redirect)
• 304 Not Modified — Cached version is still valid (conditional request)
• 403 Forbidden — Server understood the request but refuses to authorize it
• 404 Not Found — Requested resource does not exist on the server
• 410 Gone — Resource no longer exists (permanent removal with no forwarding address)
• 500 Internal Server Error — Generic server error
• 502 Bad Gateway — Server received invalid response from upstream server
• 503 Service Unavailable — Server temporarily overloaded or under maintenance
• 429 Too Many Requests — Rate limited — too many requests in a given time

When to Use an HTTP Header Checker

Use this tool whenever you deploy a new website, migrate domains, change server configurations, or suspect security or performance issues. When launching a new site, verify that redirects, security headers, and caching are configured correctly before announcing the launch. When investigating slow page loads, check the caching headers to confirm assets are being cached properly. When a client reports that their site is “not working”, the HTTP status code and headers often reveal the root cause immediately — a 500 error from a broken server configuration, a 404 from a missing page, or a 301/302 chain that adds latency. Security auditors should run header checks as part of every website security assessment to identify missing protections.