"finish" event should do it. Sometime ago I wrote a module that compresses
HTML by removing all extra whitespace, I'm attaching it here - maybe you
will find it useful.
It was working on a very simple website. For real-live app you may want to
for example check content-type header, to ensure it won't compress things
like JSON.
namespace HtmlCompressor
class Module
{
/**
* found somewhere on stack overflow
*/
private function compress($html)
{
preg_match_all('!(<(?:code|pre|script).*>[^<]+</(?:code|pre|script)>)!',$html,$pre);
$html = preg_replace('!<(?:code|pre).*>[^<]+</(?:code|pre)>!',
'#pre#', $html);
$html = preg_replace('#<!–[^\[].+–>#', '', $html);
$html = preg_replace('/[\r\n\t]+/', ' ', $html);
$html = preg_replace('/>[\s]+</', '><', $html);
$html = preg_replace('/[\s]+/', ' ', $html);
if (!empty($pre[0])) {
foreach ($pre[0] as $tag) {
$html = preg_replace('!#pre#!', $tag, $html,1);
}
}
return $html;
}
public function compressHtml(MvcEvent $e)
{
$response = $e->getResponse();
// compress HTML output
$response->setContent($this->compress($response->getContent()));
}
public function onBootstrap(MvcEvent $e)
{
$app = $e->getApplication();
$sm = $app->getServiceManager();
$eventManager = $app->getEventManager();
$eventManager->getSharedManager()->attach('Zend\Mvc\Application',
'finish',
array($this, 'compressHtml'), 1002);
}
}
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