code: public function flushAllData()
  	{
  		@trigger_error('Using Template::flushAllData() has been deprecated and will no longer work in Contao 5.0.', E_USER_DEPRECATED);
  
  		if (\function_exists('fastcgi_finish_request'))
  		{
  			fastcgi_finish_request();
  		}
  		elseif (PHP_SAPI !== 'cli')
  		{
  			$status = ob_get_status(true);
  			$level = \count($status);
  
  			while ($level-- > 0 && (!empty($status[$level]['del']) || (isset($status[$level]['flags']) && ($status[$level]['flags'] & PHP_OUTPUT_HANDLER_REMOVABLE) && ($status[$level]['flags'] & PHP_OUTPUT_HANDLER_FLUSHABLE))))
  			{
  				ob_end_flush();
  			}
  
  			flush();
  		}
  	}
docs: Flush the output buffers
  
  @deprecated Deprecated since Contao 4.0, to be removed in Contao 5.0.