Apex: ERR_RESPONSE_HEADERS_MULTIPLE_CONTENT_DISPOSITION received when downloading a file

 Issue

When downloading a file, the following popup is shown.

 

Cause

This only happens in Chrome, and according to bits of noise in (Non-Apex) forums it is because  of a comma in the filename. 

I had a comma in my report title.

In my case, overriding the filename or putting a filename in commas had no affect. 

Solution

Remove the comma from the report title


Acknowledgement

https://stackoverflow.com/questions/13578428/duplicate-headers-received-from-server


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