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Set a Referrer-Policy on Caddy

headers.referrer.missing · effort: minutes

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

  1. Add the line to the site block and reload.
Caddyfile 
header >Referrer-Policy strict-origin-when-cross-origin

Read the documentation (opens in a new tab)

Related

Scan your domain to see whether this applies to you.