On 11/11/19 1:38 PM, Kent West wrote:
On 11/11/19 10:40 AM, Brian wrote:
On Mon 11 Nov 2019 at 10:18:26 -0600, Kent West wrote:
When adding a printer via the CUPS web interface (localhost:631) on my
Debian box, Administration / Add Printer / Other Network Printers,
there are
four Internet Printing Protocol options:
https
ipp
http
ipps
Which one do I want to select? What are the differences?
'ls -l /usr/lib/cups/backend' tells you that it doesn't matter what
choice you make.
lrwxrwxrwx 1 root root 3 Oct 31 02:44 http -> ipp
lrwxrwxrwx 1 root root 3 Oct 31 02:44 https -> ipp
-rwxr-xr-x 1 root root 80120 Oct 31 02:44 ipp
lrwxrwxrwx 1 root root 3 Oct 31 02:44 ipps -> ipp
Thank you. That does tell me they are all the same. It does not tell
me why CUPS on Debian makes the other three options available (thereby
confusing the person adding the printer). There must be some reason
why a person would expect to choose X over Y; that's the difference
I'm looking for.
Okay, just learned why the CUPS web interface presents all four options;
it's because it's just reading what's available in
/usr/lib/cups/backend. When I did this:
cd /usr/lib/cups/backend
sudo ln -s ipp bub
I got this when I refreshed my CUPS web interface page:
Other Network Printers: Backend Error Handler
Internet Printing Protocol (https)
Internet Printing Protocol (ipp)
Internet Printing Protocol (http)
AppSocket/HP JetDirect
LPD/LPR Host or Printer
Internet Printing Protocol (ipps)
Internet Printing Protocol (bub)
Windows Printer via SAMBA