[Printing-architecture] GTK Print Dialog: Modern IPP printing environments cause problems

[Till Kamppeter]

On 29/07/2020 14:54, Zdenek Dohnal wrote:
> Then how would you explain printing from GTK works for some cases via
> DNS-SD based queue as it worked in our office? If it didn't work
> completely, it would be more tickets about the issue.

This is really strange for me, too, especially that I can access my 
printer correctly when not using the GTK dialog.

Marek, when the dialog discovers an IPP network printer via 
DNS-SD/Avahi, without using CUPS, how does the dialog then poll the 
printer's capability information? Is it directly doing a 
get-printer-attributes IPP request? Which URI is it using and which 
arguments ("all", "media-col-database", ...)? Or is it using some API 
function of CUPS?

    Till