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List:       kde-print
Subject:    Re: new kprinter doesn't start any more
From:       Michael Goffioul <goffioul () imec ! be>
Date:       2002-06-19 9:02:08
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> > weird, this corresponds to a "Bad request" error. However, at that point, KDEPrint
> > only tries to open a connection, nothing is sent through the socket.
> 
> This hint helped. I was then able to think of what could cause it.
> 
> As you know, I am using regularly LD_PRELOAD to load the "transconnect"
> library (Thanks to your suggestion long ago). This helps me to cross the
> passdword-enabled proxy here and use cvs, irc etc. LD_PRELOAD is called
> from the .bashrc. of users kdehead
> and kde4.
> 
> If I do "unset LD_PRELOAD" everything seems to work fine. (But I don't see the
> little new splash screen I had before....)

This is normal, the splash screen only appears after 500ms, so if the
connection is established directly, you don't see anything.

> But up to now, kprinter (and kjobviewer and kcmshell printmgr...) are the
> only apps which seem to have problems.....
> 
> Can you think of a solution?
> 
> The CONNECT call of tconn.so seems to reach the cupsd, but it then seems to
> react with "SendError() 3 code=400"....

I digged into socket code of Qt, and discovered that when you ask Qt to
connect to a host, it tries to connect twice (this happens if the connection
is established immediately, like for localhost). The first time, it uses
the correct address 127.0.0.1:631, but for some obsure reasons the second
time it uses 0.0.0.0:631 (will send a mail on kde-devel for that). This
address is usually not covered by tconn.conf as a local address, such that
tconn think it has to use a proxy, which means a real HTTP request,
and that's probably why you get a "Bad request" error from the CUPS server.
The workaround is to add this line to your tconn.conf:

localnet 0.0.0.0/255.255.255.255

I tried here and it works OK now.

Bye.
Michael.

-- 
------------------------------------------------------------------
Michael Goffioul		IMEC-DESICS-MIRA
e-mail: goffioul@imec.be	(Mixed-Signal and RF Applications)
Tel:    +32/16/28-8510		Kapeldreef, 75
Fax:    +32/16/28-1515		3001 HEVERLEE, BELGIUM
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