HTTP Header Checker

Topics: Performance and preview

Coming soon

This tool usually needs secure server-side calls, third-party APIs, or heavy processing (for example live DNS, WHOIS, or crawl jobs). We are wiring a safe version next—use the working tools in the sidebar for now.

Guide: HTTP Header Checker

Topics in this category: Performance and preview

Important HTTP headers

Headers control caching, compression, security policy, cookies, and redirects. Misconfigured redirects (chains, loops) waste crawl budget and confuse users.

Security headers like Content-Security-Policy and Strict-Transport-Security reduce XSS and downgrade risks when set correctly.