When you put an image on html, the browser will request the image's data from image server. When sending the request, the browser also send a special http header Referer whose value is a URL. Sometimes, we don't want this behavior. We have several ways to prevent it.
Update the html like the following example. Tt will influence the whole web page.
<!DOCTYPE html>
<html lang="en">
<head>
<!-- set referrer content to never ↓ -->
<meta name="referrer" content="never">
<title>example</title>
</head>
<body>
</body>
</html>
Only update the necessary img tag.
<!-- set img referrerpolicy to no-referrer ↓ -->
<img src="test.png" referrerpolicy="no-referrer">