Using WordPress ‘allowed_http_request_hosts()’ PHP function
Mark allowed redirect hosts safe for HTTP requests as well.
HTTP
Using WordPress ‘discover_pingback_server_uri()’ PHP function
Finds a pingback server URI based on the given URL.
Using WordPress ‘esc_url()’ PHP function
The `esc_url()` function in WordPress is used to sanitize URLs by removing certain characters and replacing ampersands with the appropriate entity
Using WordPress ‘get_admin_url()’ PHP function
Retrieves the URL to the admin area for a given site.