This page redirects to an external site: https://developer.wordpress.org/reference/functions/wp_sanitize_redirect/
Sanitizes a URL for use in a redirect. Removes invalid URL characters in the URL parameter.
Since: 2.3
wp_sanitize_redirect() is located in wp-includes/pluggable.php