What HTTP Response Headers Reveal About Your Site's Security Posture

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Before a browser renders any content, a web server exchanges response headers with it — and these headers can expose critical security gaps to anyone who knows how to read them. Key headers like Strict-Transport-Security (HSTS), Content-Security-Policy (CSP), and Set-Cookie attributes determine how well a site defends against common attacks such as man-in-the-middle interception, cross-site scripting, and session hijacking. According to HTTP Archive's 2025 crawl, only about 36% of pages deploy HSTS and just 21.9% send a CSP header, leaving the majority of sites without basic protective layers. Missing or misconfigured headers — such as CSP policies that include 'unsafe-inline' or session cookies lacking HttpOnly — can turn minor vulnerabilities into full account compromises. Developers can audit their own headers in seconds using browser DevTools, making it one of the quickest security checks available.

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