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Stop sending full URLs to other sites on Caddy

headers.referrer.leaky · effort: minutes

Why it matters

unsafe-url sends the full address of the page, including path and query string, to every site it links to or loads from, and no-referrer-when-downgrade does the same for every https site. Those addresses can carry search terms, account IDs or reset tokens.

The fix

  1. Set it with the > prefix so it replaces the application's value, then reload.
Caddyfile 
header >Referrer-Policy strict-origin-when-cross-origin

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Related

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