HTTP Headers Explained: Request, Response & Security

Complete guide to HTTP headers: common request/response headers, security headers, caching headers, and CORS headers.

Essential Request Headers

Accept: application/json\nAuthorization: Bearer eyJhbGci...\nContent-Type: application/json\nUser-Agent: Mozilla/5.0...\nCookie: session=abc123

Security Response Headers

Strict-Transport-Security: max-age=31536000\nContent-Security-Policy: default-src 'self'\nX-Content-Type-Options: nosniff\nX-Frame-Options: DENY\nReferrer-Policy: no-referrer

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