HTTP Security Headers: What They Do and How to Configure Them

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HTTP security headers are server-sent response directives that instruct browsers on how to handle resources, restrict content origins, and limit information exposure. They help defend against common threats such as cross-site scripting, clickjacking, MIME-type confusion, and unsafe resource loading. Key headers include Content-Security-Policy, which controls where browsers may load scripts, styles, and media, and HTTP Strict Transport Security, which enforces HTTPS-only access. Developers can test restrictive policies safely using report-only mode before fully enforcing them. Security headers are not a substitute for secure coding practices but serve as an additional defensive layer alongside authentication, input validation, and HTTPS.

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