Security implications of HTTP response headers

HTTP response headers carry metadata that governs how browsers handle web resources and can either expose sensitive information or provide important defenses against threats such as cross-site scripting, clickjacking, man-in-the-middle attacks, session hijacking, CSRF, and data leakage. Key security headers include HTTP Strict Transport Security, which enforces HTTPS; Content-Security-Policy, which restricts trusted content sources and can be combined with Subresource Integrity; X-Content-Type-Options, which prevents MIME-type sniffing; X-Frame-Options, which limits framing to counter clickjacking; and Referrer-Policy, which reduces disclosure of referral data. Effective configuration emphasizes restrictive default policies, explicit trusted sources and MIME types, appropriate HSTS durations, and avoiding unnecessary data exposure. JavaScript developers can implement these protections through Helmet middleware for Express or Fastify, while tools such as check-my-headers can scan deployed sites for header-related weaknesses.

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