Security headers protect against common web vulnerabilities. Here's how to implement them.
Content-Security-Policy (CSP)
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CSP with Nonces
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Strict-Transport-Security (HSTS)
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X-Frame-Options
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X-Content-Type-Options
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Referrer-Policy
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Permissions-Policy
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Cross-Origin Headers
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Complete Helmet Configuration
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Next.js Security Headers
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Testing Security Headers
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Best Practices
Implementation:
✓ Start with Report-Only mode
✓ Test thoroughly before enforcing
✓ Use helmet for Express apps
✓ Configure per environment
CSP:
✓ Start restrictive, loosen as needed
✓ Use nonces for inline scripts
✓ Avoid 'unsafe-inline' if possible
✓ Monitor CSP reports
Maintenance:
✓ Regularly review headers
✓ Test after dependencies update
✓ Monitor security reports
✓ Keep up with new standards
Conclusion
Security headers provide defense-in-depth against common web attacks. Start with Helmet's defaults, customize CSP for your needs, and use tools like Mozilla Observatory to verify your configuration. Test thoroughly in staging before deploying to production.