HTTP Headers Checker
View a website's security, cache and server headers — grouped and explained, with a clear pass/warning/missing status for every security header.
About this tool
HTTP response headers carry information beyond the visible page content — caching rules, security policies, server hints, and more. This tool groups a site's headers into security, cache/delivery, and server/technical categories, with every security header individually explained and statused, plus the complete raw header list in an expandable section.
Why some security headers might be missing
A missing security header isn't necessarily a mistake — not every site needs every header, and some are set at a CDN or load balancer layer that a single fetch might not fully reflect. This is a diagnostic signal, not a definitive security audit.
Related tools: