Unfortunately there are filters which produce this MIME type (such as
hpps from hplip), and if someone uses such driver on client and server
has IPP Everywhere/driverless driver, job fails.
The patch (together with change in libcupsfilters, which will come later)
fixes the issue.
#
application/postscript application/vnd.universal-input 0 -
+application/vnd.cups-postscript application/vnd.universal-input 0 -
# CUPS file conversion rules for PostScript input when we are working
# with the PDF printing workflow: General PostScript input should be