WordPress at a glance
filter is not described

wpsupercache_404 filter-hook . WPSCache 1.0

Usage

add_filter( 'wpsupercache_404', 'filter_function_name_320' );
function filter_function_name_320( $false ){
	// filter...

	return $false;
}
$false
-

Where the hook is called

wp_cache_get_ob()
wpsupercache_404
wp-super-cache/wp-cache-phase2.php 1993
if ( isset( $wp_super_cache_query[ 'is_404' ] ) && false == apply_filters( 'wpsupercache_404', false ) ) {

Where in WP core the hook is used WP Super Cache

Usage not found.