Question 1

What are HTTP security headers?

Accepted Answer

HTTP security headers are response headers a server sends that tell the browser how to behave defensively — for example, restricting which scripts can run (CSP), forcing HTTPS (HSTS), or blocking clickjacking (X-Frame-Options).

Question 2

Which header matters most?

Accepted Answer

Content-Security-Policy generally has the biggest security impact since it directly mitigates cross-site scripting (XSS), followed by Strict-Transport-Security for transport security.

Question 3

How do I add these headers to my site?

Accepted Answer

Most hosting platforms and frameworks let you set custom response headers in configuration (e.g. next.config.js headers(), an Nginx/Apache config, or a reverse proxy/CDN rule) without changing application code.

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