wp_remote_head()
Function: Performs an HTTP request using the HEAD method and returns its response.
Source: wp-includes/http.php:194
wp_remote_retrieve_headers()
Function: Retrieve only the headers from the raw response.
Source: wp-includes/http.php:211
_wp_http_get_object()
Function: Returns the initialized WP_Http Object
Source: wp-includes/http.php:20
wp_safe_remote_request()
Function: Retrieve the raw response from a safe HTTP request.
Source: wp-includes/http.php:44
wp_safe_remote_get()
Function: Retrieve the raw response from a safe HTTP request using the GET method.
Source: wp-includes/http.php:65