Calendar Base

Several wrong HTTP Headers are send in ICS view. These are defined in class.tx_cal_icsview.php on line 192 ff.

    if($sendHeaders) {
        header('Expires: 0');
        header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
        header('Content-Disposition: attachment; filename='.$title);
        header('Content-Type: text/ics');
        header('Pragma: ');
        header('Cache-Control:');
    }

• Expires: 0 -> invalid, it must be in RFC 1123 date format (see RFC 2616 section 14.21)
• Cache-Control: must-revalidate, post-check=0, pre-check=0 -> unnecessary (see http://blogs.msdn.com/b/ieinternals/archive/2009/07/20/using-post_2d00_check-and-pre_2d00_check-cache-directives.aspx)
• Content-Type: text/ics -> should/could be: Content-type:text/calendar; charset=utf-8
• Pragma: -> undefined
• Cache-Control: -> undefined, overwrites the previously set value

Sugestion: delete the header() commands other than Content-Disposition:... in class.tx_cal_icsview.php and define them in TypoSript Setup.