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

Hi, I'm using HTTP::Server::Simple to run a few simulations and I am experiencing a strange problem. Whenever I enter a very big url, perl isn't able to execute any commands anymore (the result of qx{} simply is empty, system says it can't spawn cmd.exe). Here is the test code: 
package HTTP::Server::Simple::Test;
our $VERSION = 0.1;
 

use base qw(HTTP::Server::Simple::CGI);
 

sub handle_request {
    my ( $self, $cgi ) = @_;
    my $res = qx("dir");
    print "$res\n";
}

1;

[download]
use warnings;
use strict;
 
use HTTP::Server::Simple::Test;
 
my $server = HTTP::Server::Simple::Test->new();
$server->run();

[download]
Entering http://localhost:8080/ returns the expected result, namely a dir of the directory where the script ist run. But entering a big url into the browser causes perl to fail executing the command. eg. the following url will cause perl to fail executing the command. 
http://localhost:8080/?add=1&AllNodesAlgo=projects.tree.nodes.algos.Al
+goABC&AllNodesAlgoIncreaseValue=false&AllNodesAlgoSendAfterxSeconds=0
+&AllNodesAlgoSendAllIfOne=true&AllNodesAlgoSendIfSumOfAll=true&AllNod
+esAlgoSendValue=projects.tree.nodes.algos.sendvalue.LastValue&AllNode
+sCosts=projects.tree.costs.AllCosts&AllNodesCostsAggr=projects.tree.n
+odes.algos.costaggregation.Average&AllNodesEdgeCostsMultiplier=100&Al
+lNodesInputDistribution=projects.tree.nodes.data.SensorScopeInputData
+&AllNodesInputDistributionPoissonLambda=10&AllNodesInputDistributionS
+ensorScopeValue=Temperature&AllNodesMessageAggr=projects.tree.nodes.m
+essages.messageaggregation.ForwardMessageAggregation&AllNodesMessageV
+alueAggr=projects.tree.nodes.messages.valueaggregation.Average&AllNod
+esSleep=projects.tree.nodes.algos.sleep.NoSleep&AllNodesSleepSimpleSl
+eepRoundsAwake=10&AllNodesSleepSimpleSleepThreshold=1&AllNodesSleepSi
+mpleSleepValues=50&AllNodesSleepSimpleSleepWakeUpEveryXRounds=50&Defa
+ultRoundsToRun=155&DefaultRoundsToSkip=0&DefaultStructure=projects.tr
+ee.structure.BuildSensorScopeTree&DefaultStructureBuildBinaryTreeFano
+ut=2&DefaultStructureBuildBinaryTreeNumberOfLeafNodes=128&DefaultStru
+ctureSensorScopeRootNodeIds=65&RootNodesAlgo=projects.tree.nodes.algo
+s.AlgoABC&RootNodesAlgoIncreaseValue=false&RootNodesAlgoSendAfterxSec
+onds=0&RootNodesAlgoSendAllIfOne=true&RootNodesAlgoSendIfSumOfAll=tru
+e&RootNodesAlgoSendValue=projects.tree.nodes.algos.sendvalue.LastValu
+e&RootNodesCosts=projects.tree.costs.AllCosts&RootNodesCostsAggr=proj
+ects.tree.nodes.algos.costaggregation.Average&RootNodesEdgeCostsMulti
+plier=100&RootNodesInputDistribution=projects.tree.nodes.data.SensorS
+copeInputData&RootNodesInputDistributionPoissonLambda=10&RootNodesInp
+utDistributionSensorScopeValue=Temperature&RootNodesMessageAggr=proje
+cts.tree.nodes.messages.messageaggregation.ForwardMessageAggregation&
+RootNodesMessageValueAggr=projects.tree.nodes.messages.valueaggregati
+on.Average&RootNodesSleep=projects.tree.nodes.algos.sleep.NoSleep&Roo
+tNodesSleepSimpleSleepRoundsAwake=10&RootNodesSleepSimpleSleepThresho
+ld=1&RootNodesSleepSimpleSleepValues=50&RootNodesSleepSimpleSleepWake
+UpEveryXRounds=50&X_DefaultLegend=Algo+.&X_Show=All&show=35f8efe1ce02
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[download]
Maybe someone can shed light on this? Thanks.

Edit: g0n - readmore tags

Replies are listed 'Best First'.
Re: Problem with qx/system and long urls
by Thelonius (Priest) on Apr 24, 2007 at 15:28 UTC
    My educated guess:

    Windows CMD.EXE has a limit on the total # of bytes for environment variables and the names of the variables: 32,767. Your URL has 16K bytes, and it's put in the environment more than once (request_uri, path, query_string). So the process can't be created with that big an environment.

    Solution: use HTTP POST method instead of GET.

    Although the IETF standards don't specify a maximum length for URLs, RFC2616 does say "Note: Servers ought to be cautious about depending on URI lengths above 255 bytes, because some older client or proxy implementations might not properly support these lengths."

    FYI: Microsoft IE and IIS limit URLs to about 2K.

[reply]
      Thanks for your answer! I used GET because I wanted to have bookmarkable urls, so I could rerun the simulation again and again, or even send the link to another person who could then run the simulation on his computer, by simply clicking the link. So I guess I have to find a workaround for this. By using HTTP POST, I'm not able to bookmark the urls anymore. Does the linux shell (bash) has the same limit, or can environment variables be undefinitely big? I could start the server in cygwin or even vmware with linux then.
[reply]
        Could you collect the data that is in the post into a database row and give people that row id as a token in a single query string param?

        Phil

        The Gantry Web Framework Book is now available.
[reply]
        {
    local %ENV = map { $_ => "$ENV{$_}" } qw{
        ALLUSERSPROFILE
        APPDATA
        COMMONPROGRAMFILES
        COMPUTERNAME
        COMSPEC
        FB_FILE
        HOMEDRIVE
        HOMEPATH
        LOGONSERVER
        OS
        PATH
        PATHEXT
        PROGRAMFILES
        PROMPT
        SESSIONNAME
        SYSTEMDRIVE
        SYSTEMROOT
        TEMP
        USERDOMAIN
        USERNAME
        USERPROFILE
        WINDIR
    };
    print qx{ dir };
}

        [download]
[reply]
[d/l]

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