W3TC breaks my audio downloader

Resolved wombatsuit
(@wombatsuit)

10 years, 9 months ago
Hi, W3TC is working well for me except on pages that I have audio download links. Whenever anyone clicks to download an MP3, the resulting file contains only the following text instead of the binary MP3 data:
Fatal error: Unknown: Cannot use output buffering in output buffering display handlers in Unknown on line 0 

Here’s the crucial snippet from our download plugin. Is there any way to disable caching for pages served by this plugin. It’s keyed to a trailing “folder” on the url called “/download-audio”
```
header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header( "Cache-Control: private", false);
header("Content-Type: application/force-download");
header("Content-Type: application/octet-stream");
header("Content-Type: application/download");
header('Content-Disposition: attachment; filename="'.$file_name.'";');
header("Content-Transfer-Encoding: binary");
$filesize = filesize($full_filename);
if ($filesize != 0)
header("Content-Length: ".$filesize);
ob_clean();
flush();
readfile($full_filename);
exit;
```
http://wordpress.org/extend/plugins/w3-total-cache/

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Thread Starter

(@wombatsuit)

Okay, I figured out a work-around. The problem was coming from the readfile() function since it sends the file to the output buffer. I just disabled output buffering (call ob_end_clean();) before the code runs:

ob_end_clean();
header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header( "Cache-Control: private", false);
header("Content-Type: application/force-download");
header("Content-Type: application/octet-stream");
header("Content-Type: application/download");
header('Content-Disposition: attachment; filename="'.$file_name.'";');
header("Content-Transfer-Encoding: binary");
$filesize = filesize($full_filename);
if ($filesize != 0)
header("Content-Length: ".$filesize);
ob_clean();
flush();
readfile($full_filename);
exit;

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