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Set a Referrer-Policy on Apache

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 virtual host or .htaccess (mod_headers) and reload.
apache 
Header always set Referrer-Policy "strict-origin-when-cross-origin"

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Related

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