Use meta referrer tag to control referrer information ✣ S.Bistrović

HTML halibut says:

Use meta referrer tag to control how much referrer information your site shares.

And here’s why:

You can stop websites from seeing too much about where a visitor came from.
You can stop websites from seeing too much about a visitor’s origin.
meta referrer tag helps prevent hackers or trackers from getting details they shouldn’t.
When users click a link, you decide how much referrer information other websites get.
Ads and analytics tools use referrer data, and this tag helps you control what they see.
Browsers might remove referrer information when switching from a secure to an insecure site, but you can manage this.

Here are some tips on defining the meta referrer tag.

Use the no-referrer value to prevent sending any referrer info.
Use the no-referrer-when-downgrade value to send referrer information only if the destination is also HTTPS.
Use the origin value to send only the domain, not the full URL.
Use the origin-when-cross-origin value to send full referrer information for same-site links, but only domain for external sites.
Use the same-origin value to send referrer information only for same-site links.
Use the strict-origin-when-cross-origin value to send full referrer information for same-site links, but only domain for HTTPS external sites, and nothing for HTTP.

Here’s how to use it:

<meta name="referrer" content="no-referrer">