<p>Called before the app pre render method is called.</p>

<p>Callback signature:</p>
<blockquote><code><em>\XF\Mvc\Dispatcher</em> $dispatcher, <em>\XF\Mvc\Reply\AbstractReply</em> $reply, $responseType</code></blockquote>

<p>Arguments:</p>
<ol>
	<li><code><em>\XF\Mvc\Dispatcher</em> $dispatcher</code> - Dispatcher object.</li>
	<li><code><em>\XF\Mvc\Reply\AbstractReply</em> $reply</code> - Reply object.</li>
	<li><code>$responseType</code> - Response type as a string, e.g. 'html', 'json' etc.</li>
</ol>