ver headers, which the output class will send for you when outputting the final rendered display.  Example:</p>

<code>
$this->output->set_header("HTTP/1.0 200 OK");<br />
$this->output->set_header("HTTP/1.1 200 OK");<br />
$this->output->set_header('Last-Modified: '.gmdate('D, d M Y H:i:s', $last_update).' GMT');<br />
$this->output->set_header("Cache-Control: no-store, no-cache, must-revalidate");<br />
$this->output->set_header("Cache-Control: post-check=0, pre-check=0");<br />
$this->output->set_header(