Headers fixes

Step-by-step fixes for headers on the stacks below. Each page links to the matching HttpFixer tool for live diagnostics.

• Fix Missing Security Headers on Nginx
• Fix Missing Security Headers on Apache
• Fix Missing Security Headers on Cloudflare
• Fix Missing Security Headers on Vercel
• Fix Missing Security Headers on Netlify
• Fix Missing Security Headers on Express
• Fix SharePoint CSP 'Refused to Load' — 2026 Enforcement