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fix/add clickjacking solutiion #121

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15 changes: 15 additions & 0 deletions backend/README.md
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Expand Up @@ -68,6 +68,10 @@ server {
root /var/www/beeport/out/;
index index.html;

# Clickjacking protection (X-Frame-Options + CSP frame-ancestors)
add_header X-Frame-Options "DENY" always;
add_header Content-Security-Policy "frame-ancestors 'none'" always;

location / {
try_files $uri /index.html;
}
Expand Down Expand Up @@ -302,6 +306,17 @@ sudo nginx -t
sudo systemctl reload nginx
```

## Security: Clickjacking (X-Frame-Options)

To prevent clickjacking, the nginx example includes:

- **X-Frame-Options: DENY** – tells the browser not to render the site in a frame/iframe.
- **Content-Security-Policy: frame-ancestors 'none'** – modern equivalent; use both for broad browser support.

Set these once in the main HTTPS `server` block that serves the frontend HTML. They do not need to be duplicated in API proxy locations such as `/bzz`, `/stamps`, `/wallet`, `/tags`, or `/health`.

If you serve Beeport from another host (e.g. beeport.ethswarm.org), ensure the same headers are set in that server’s nginx or CDN config so the app cannot be embedded in malicious iframes.

## Troubleshooting CORS Issues

If you're still getting CORS errors, try these debugging steps:
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