Crossing from a particular site
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Describe the option of blocking the transition from a certain Nginx website and Apache2
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Found a response for nginx in configuration in the Server section.
if ($http_referer ~* "site\.ru") { return 403; }
for Apache2
RewriteCond %{HTTP_REFERER} ^http://www\.site\.(.*) [NC] RewriteRule .* - [F]