Fix · nginx
Fix “Content Security Policy (CSP)” on nginx
Start with: Content-Security-Policy: default-src 'self'; object-src 'none'; base-uri 'self' -- then tighten.
add_header Content-Security-Policy "default-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'none'" always;
Verify the fix
Re-run the Content Security Policy (CSP) check after deploying. Test config changes in staging first and keep a rollback: a wrong header can break a site faster than a missing one.
Other stacks: Apache · Caddy · Express / Node · Cloudflare