ViewAction.php

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<?php
class ViewAction extends FormlessAction {

    public function getName() {
        return 'view';
    }

    public function onView() {
        return null;
    }

    public function show() {
        $config = $this->context->getConfig();

        if (
            $config->get( 'DebugToolbar' ) == false && // don't let this get stuck on pages
            $this->page->checkTouched() // page exists and is not a redirect
        ) {
            // Include any redirect in the last-modified calculation
            $redirFromTitle = $this->page->getRedirectedFrom();
            if ( !$redirFromTitle ) {
                $touched = $this->page->getTouched();
            } elseif ( $config->get( 'MaxRedirects' ) <= 1 ) {
                $touched = max( $this->page->getTouched(), $redirFromTitle->getTouched() );
            } else {
                // Don't bother following the chain and getting the max mtime
                $touched = null;
            }

            // Send HTTP 304 if the IMS matches or otherwise set expiry/last-modified headers
            if ( $touched && $this->getOutput()->checkLastModified( $touched ) ) {
                wfDebug( __METHOD__ . ": done 304\n" );
                return;
            }
        }

        $this->page->view();
    }
}