concrete/src/Cache/Page/PageCache.php
public function getCacheHeaders(ConcretePage $c)
    {
        $lifetime = $c->getCollectionFullPageCachingLifetimeValue();
        $expires = gmdate('D, d M Y H:i:s', time() + $lifetime) . ' GMT';

        $headers = [
            'Pragma' => 'public',
            'Cache-Control' => 'max-age=' . $lifetime . ',s-maxage=' . $lifetime,
            'Expires' => $expires,
        ];

        return $headers;
    }
public function getCacheHeaders(ConcretePage $c)
    {
        $lifetime = $c->getCollectionFullPageCachingLifetimeValue();
        $expires = gmdate('D, d M Y H:i:s', time() + $lifetime) . ' GMT';

        $headers = [
            'Pragma' => 'public',
            'Cache-Control' => 'max-age=' . $lifetime . ',s-maxage=' . $lifetime,
            'Expires' => $expires,
        ];

        return $headers;
    }
public function getCacheHeaders ( ConcretePage $ c ) { $ lifetime = $ c -> getCollectionFullPageCachingLifetimeValue ( ) ; $ expires = gmdate ( 'D, d M Y H:i:s' , time ( ) + $ lifetime ) . ' GMT' ; $ headers = [ 'Pragma' => 'public' , 'Cache-Control' => 'max-age=' . $ lifetime . ',s-maxage=' . $ lifetime , 'Expires' => $ expires , ] ; return $ headers ; }
Get the cache-related HTTP headers for a page.

@param \Concrete\Core\Page\Page $c

@return array Keys are the header names; values are the header values
Get the cache - related HTTP headers for a page .