CGI Perl output cut with xampp

toohoo has asked for the wisdom of the Perl Monks concerning the following question:

Hello everybody,

Today I have an issue with Perl and XAMPP. I checked the Perl version included with XAMPP:

D:\xampp\perl\bin>perl -v

This is perl 5, version 16, subversion 3 (v5.16.3) built for MSWin32-x
+86-multi-thread

Copyright 1987-2012, Larry Wall

Perl may be copied only under the terms of either the Artistic License
+ or the
GNU General Public License, which may be found in the Perl 5 source ki
+t.

Complete documentation for Perl, including FAQ lists, should be found 
+on
this system using "man perl" or "perldoc perl".  If you have access to
+ the
Internet, point your browser at http://www.perl.org/, the Perl Home Pa
+ge.
[download]

I have an old little Perl app coded really very low. But it worked as far, I meant. Today I stumbled upon an effect. The output - if it becomes over 256KB - stops at this border and hangs. It does not load further. First I tought of it would be of an own programmed limmitation. But in the content of the output, if I add some output it stops more early in content but also at 256KB.

Are there known limitations in the size of the output of XAMPP or of the Perl version included in XAMPP?

Thanks in advance, best regards ..

Comment on CGI Perl output cut with xampp Download Code

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Re: CGI Perl output cut with xampp by NetWallah (Canon) on Jul 05, 2016 at 17:45 UTC
Look for the apache log at `\xampp\apache\logs\error.log` [download] or thereabouts (depening on how you installed it). That may hold clues to potential truncation, or apache buffers being exceeded, or perhaps data delivery timeouts. There is no time like the present for postponing what you ought to be doing.	[reply] [d/l]
Re^2: CGI Perl output cut with xampp by toohoo (Beadle) on Jul 06, 2016 at 13:40 UTC
the most errors in log are "use of uninitialized value". Then there is a "$* is no longer supported" (use of an old version of cgi-lib). An "\\1 better written as $1". And an "odd number of elements in hash assignment". thanks	[reply]
Re^3: CGI Perl output cut with xampp by NetWallah (Canon) on Jul 08, 2016 at 18:13 UTC
The "odd number of elements in hash assignment" indicates a programming error - potentially caused by mishandling of (unexpected formatting) incoming data. There is a possibility that the incorrectly populated hash may result in incomplete data displayed. You will need to examine the code and related data - I suggest you run the code under the command line debugger, and isolate the issue. There is no time like the present for postponing what you ought to be doing.	[reply]
Re^4: CGI Perl output cut with xampp by toohoo (Beadle) on Aug 19, 2016 at 11:09 UTC
Re^5: CGI Perl output cut with xampp by Corion (Patriarch) on Aug 19, 2016 at 11:18 UTC
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Re^5: CGI Perl output cut with xampp by NetWallah (Canon) on Aug 19, 2016 at 14:16 UTC
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Re: CGI Perl output cut with xampp by Corion (Patriarch) on Jul 05, 2016 at 13:09 UTC
Maybe your client is not reading the data fast enough? To give more detailed help, we will need a short, self-contained program that reproduces the problem.	[reply]
Re^2: CGI Perl output cut with xampp by toohoo (Beadle) on Jul 05, 2016 at 13:22 UTC
A little correction: I've corrected some debug output. Now the border is at ~320KB The project is under github/toohoo/thofaq The problem cannot be tested with this because of the little database. In an existing use case I have more data, about 76 FAQ. The output stops at 50 round about. What is disturbing: If I switch to edit, all FAQ are put out. And that nonetheless the output is greater. have no idea. :-/	[reply]
Re^3: CGI Perl output cut with xampp by Corion (Patriarch) on Jul 05, 2016 at 13:35 UTC
If the problem seems to correspond to the output size, maybe just creating a program that outputs that much data already reproduces the problem? I'm not sure what your expectation is how we could help you here better. We are not clairvoyant and you have not shown us any approach to reproducing the problem nor a succinct description of where/how the problem happens at all. If you are talking about a webpage, maybe telling us which of the many, many Perl scripts in the (not linked) Github repository is the one that is problematic allows somebody here to spot the problem a bit better. But I recommend to post the relevant code after shortening it to say 20-30 lines instead of linking to some github repository. Please also make sure that the problem still persists after shortening the code.	[reply]
Re^4: CGI Perl output cut with xampp by toohoo (Beadle) on Jul 05, 2016 at 13:46 UTC
Re^5: CGI Perl output cut with xampp by Corion (Patriarch) on Jul 05, 2016 at 15:15 UTC
Re^5: CGI Perl output cut with xampp by Laurent_R (Canon) on Jul 05, 2016 at 15:22 UTC
Re^5: CGI Perl output cut with xampp by Anonymous Monk on Jul 05, 2016 at 14:27 UTC
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Re^5: CGI Perl output cut with xampp by toohoo (Beadle) on Jul 06, 2016 at 13:53 UTC
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Re: CGI Perl output cut with xampp by poj (Abbot) on Jul 05, 2016 at 15:27 UTC
What is the XAMPP version ? poj	[reply]
Re^2: CGI Perl output cut with xampp by toohoo (Beadle) on Jul 06, 2016 at 13:32 UTC
the readme says: ApacheFriends XAMPP Version 5.6.15 thanks so far	[reply]