ERR_INVALID_RESPONSE

[nbranning]

I am getting a ERR_INVALID_RESPONSE on my live server. The download works great on localhost. I have tried adding headers but no luck. Any suggestions? Could it be server related?

[julianpollmann]

Even if this is older than a year, try to get as much debug information as possible.
If your live server uses zlib compression, ob_end_clean(); around line 332 in PhpExcelComponent could be the problem. You can solve it by changing it to:

$ob_get_status = ob_get_status();
if($ob_get_status['name']!='zlib output compression')ob_clean();

You should also consider upgrading the PhpExcel Library, as it's outdated in this Plugin.