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Add in index.php file.

   if(isset($_SERVER['HTTP_ACCEPT_ENCODING']) && substr_count($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip'))
        ob_start('ob_gzhandler');
    else
        ob_start();

    header('Vary: Accept-Encoding');
    header('Accept-Encoding:gzip');
    header('Cache-Control:public, max-age=31536000');
    header('Connection:keep-alive');
    header('Content-Type:text/html; charset=UTF-8');

    $offset = 60 * 60;
    $expire = "expires: " . gmdate("D, d M Y H:i:s", time() + $offset) . " GMT";
    header( $expire );