Service::setEndBufferContentHandler

static function setEndBufferContentHandler($content): void
{
	$eventManager = MainEventManager::getInstance();
	$eventManager->addEventHandler(
		'main',
		'onEndBufferContent',
		static function(&$resultContent) use ($content)
		{
			header('Content-Type: text/plain');
			$resultContent = $content;
		}
	);
}