Set a Referrer-Policy on Caddy
Why it matters
Without one, how much of your page addresses other sites receive depends on each browser's default. strict-origin-when-cross-origin sends only your domain to other sites and nothing over insecure connections.
The fix
- Add the line to the site block and reload.
Caddyfile
header >Referrer-Policy strict-origin-when-cross-origin Related
Scan your domain to see whether this applies to you.