wpsc_is_https() │ WPSCache 1.0

Хуков нет.

Возвращает

null. Ничего (null).

Использование

wpsc_is_https();

Код wpsc_is_https() WPSCache 3.1.1

wp-super-cache/wp-cache-phase2.php 
function wpsc_is_https() {
	// Also supports https requests coming from an nginx reverse proxy
	return ( ( isset( $_SERVER['HTTPS'] ) && 'on' == strtolower( $_SERVER['HTTPS'] ) ) || ( isset( $_SERVER['HTTP_X_FORWARDED_PROTO'] ) && 'https' == strtolower( $_SERVER['HTTP_X_FORWARDED_PROTO'] ) ) );
}