[Warning] Cannot modify header information - headers already sent by (output started at /www/htdocs/w00d22ab/alto/code/BuchPage.php:1)

Source

653 			header('Last-Modified: ' . gmdate("D, d M Y H:i:s", $rss->lastModified) . ' GMT');
654 		}
655 		if(!empty($rss->etag)) {
656 			HTTP::register_etag($rss->etag);
657 		}
658 		$xml = str_replace(' ', ' ', $rss->renderWith('RSSFeed'));
659 		$xml = preg_replace('/<!--(.|\s)*?-->/', '', $xml);
660 		$xml = trim($xml);
661 		HTTP::add_cache_headers();
662 		header("Content-type: text/xml");
663 		echo $xml;
664 	}
665 	
666 	public function import()
667 	{
668     if(isset($this->urlParams['ID']))

Trace

• header(Content-type: text/xml)
  Line 662 of Calendar.php
• Calendar_Controller->rss(SS_HTTPRequest)
  Line 193 of Controller.php
• Controller->handleAction(SS_HTTPRequest)
  Line 137 of RequestHandler.php
• RequestHandler->handleRequest(SS_HTTPRequest)
  Line 147 of Controller.php
• Controller->handleRequest(SS_HTTPRequest)
  Line 199 of ContentController.php
• ContentController->handleRequest(SS_HTTPRequest)
  Line 67 of ModelAsController.php
• ModelAsController->handleRequest(SS_HTTPRequest)
  Line 281 of Director.php
• Director::handleRequest(SS_HTTPRequest,Session)
  Line 124 of Director.php
• Director::direct(/seminare/rss)
  Line 127 of main.php