February 12, 2011 
Definition:
function wp_get_nocache_headers() {}
Gets the header information to prevent caching.
The several different headers cover the different ways cache prevention is handled by different browsers
Return values
returns:The associative array of header names and field values.
Defined filters
- nocache_headers
apply_filters('nocache_headers', $headers)
Source code
function wp_get_nocache_headers() {
$headers = array(
'Expires' => 'Wed, 11 Jan 1984 05:00:00 GMT',
'Last-Modified' => gmdate( 'D, d M Y H:i:s' ) . ' GMT',
'Cache-Control' => 'no-cache, must-revalidate, max-age=0',
'Pragma' => 'no-cache',
);
if ( function_exists('apply_filters') ) {
$headers = (array) apply_filters('nocache_headers', $headers);
}
return $headers;
}
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A HitchHackers guide through WordPress 
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