Hello! I use this plugin to provide my site visitors downloads: http://wordpress.org/extend/plugins/delightful-downloads/
Unfortunately it is not working together with wp super cache. The issue seems to be that the download plugin cannot change the headers and so the requested file is shown in the browser window instead offered for download. My apache error logs say the following:
[Sun Mar 24 11:55:20 2013] [error] PHP Warning: Cannot modify header information - headers already sent in /var/www/vhosts/fluegelchen.net/httpdocs/blog-7/wp-content/plugins/delightful-downloads/includes/process-download.php on line 64, referer: http://fluegelchen.net/blog/bluten-auf-die-fotos-drauf/
I have tried to exclude "*ddownload*" from the cache but that didn't help. Does anyone have an idea how I can tell the cache plugin to not handle the downloads?