nocache_headers filter-hook . WP 2.8.0

Filters the cache-controlling headers.

Usage

add_filter( 'nocache_headers', 'filter_function_name_6575' );
function filter_function_name_6575( $headers ){
	// filter...

	return $headers;
}

$headers(array)

Header names and field values.

• $Expires (string)
  Expires header.

• $Cache-Control (string)
  Cache-Control header.

Where the hook is called

$headers = (array) apply_filters( 'nocache_headers', $headers );

Where the hook is used (in WP core)