Re: 0 being appended to non mod_perl scripts.
On Thu, 2002-03-21 at 08:37, Mike Wille wrote: Hello all, I apologize if this has already been answered elsewhere, I haven't been able to find it. I am encountering a wierd problem where perl scripts running under a normal cgi-bin (ie no mod_perl) have a '0' appended to the output. This does not happen to scripts run under mod_perl. It also only happens when PerlSendHeader is set to on. I thought that PerlSendHeader was a mod_perl only directive, but just to check I added PerlSendHeader off to the cgi-bin directory. That had no effect. Has anyone else encountered this and how did you fix it? Are you sure this isn't an artifact of chunked encoding? Perhaps your browser or Apache are handling the encoding badly. I suggest you use a tool such as ethereal to examine the data on the wire. -jwb
RE: 0 being appended to non mod_perl scripts.
Well, after much testing, I've found the problem does not lie with mod_perl. I'm not sure of the source now, I just know how to recreate it. Originally it seemed like mod_perl but it was just a coincidence that it the problem started after making some configuration changes. The only thing I need to do to recreate the problem is include a 'use Whatever::Module;' in a simple hello world Perl script under mod_cgi. Mod_perl does not ever append the 0. System and exec calls do not cause the 0 to be displayed either. I have no idea what is causing this as the setup is an out of the box Red Hat 7.2 installation. But that is off topic... But thanks to everyone who answered this post! - Mike -Original Message- From: Stas Bekman [mailto:[EMAIL PROTECTED]] Sent: Thursday, March 21, 2002 8:56 PM To: Randal L. Schwartz Cc: Mike Wille; [EMAIL PROTECTED] Subject: Re: 0 being appended to non mod_perl scripts. Randal L. Schwartz wrote: Mike == Mike Wille [EMAIL PROTECTED] writes: Mike I am encountering a wierd problem where perl scripts running under a normal Mike cgi-bin (ie no mod_perl) have a '0' appended to the output. I've seen this happen when people mistakenly write: print system foo; instead of print `foo`; but of course they should have written: system foo; instead. As to why it's not happening in an Apache::Registry script, I cannot say. Because , the output of system(), exec(), and open(PIPE,|program) calls will not be sent to the browser unless your Perl was configured with sfio. http://perl.apache.org/guide/porting.html#Output_from_system_calls -- _ Stas Bekman JAm_pH -- Just Another mod_perl Hacker http://stason.org/ mod_perl Guide http://perl.apache.org/guide mailto:[EMAIL PROTECTED] http://ticketmaster.com http://apacheweek.com http://singlesheaven.com http://perl.apache.org http://perlmonth.com/
RE: 0 being appended to non mod_perl scripts.
At 14:48 22.03.2002 -0500, Mike Wille wrote: Well, after much testing, I've found the problem does not lie with mod_perl. I'm not sure of the source now, I just know how to recreate it. Originally it seemed like mod_perl but it was just a coincidence that it the problem started after making some configuration changes. The only thing I need to do to recreate the problem is include a 'use Whatever::Module;' in a simple hello world Perl script under mod_cgi. Mod_perl does not ever append the 0. System and exec calls do not cause the 0 to be displayed either. I have no idea what is causing this as the setup is an out of the box Red Hat 7.2 installation. But that is off topic... But thanks to everyone who answered this post! In that case it's most probably the point Jeffrey W. Baker noted about chunked encoding. Your User Agent might not be handling it. I suspect that you don't get the 0 from static files, or anything which sends a Content-Length header. Look more into the raw transmitted data, and you might find out something. -- Per Einar Ellefsen [EMAIL PROTECTED]
Re: 0 being appended to non mod_perl scripts.
Per Einar Ellefsen [EMAIL PROTECTED] writes: I suspect that you don't get the 0 from static files, or anything which sends a Content-Length header. Look more into the raw transmitted data, and you might find out something. Might it be an HTTP/1.1 KeepAlive artefact? -- David Hodgkinson, Wizard for Hirehttp://www.davehodgkinson.com Editor-in-chief, The Highway Star http://www.deep-purple.com All the Purple Family Tree news http://www.slashrock.com Interim Technical Director, Web Architecture Consultant for hire
Re: 0 being appended to non mod_perl scripts.
[reminder: keep replies CC'ed to the list! Thanks] Mike Wille wrote: Thanks for the suggestion, but I mentioned earlier that mod_perl is not running these scripts appended with a 0. Everything in cgi-bin which includes everything with a 0 appended is being run under mod_cgi. As I suggested remove all the configurations you have added, and just add a simply ScriptAlias and test. still having a problem? than it has nothing to do with mod_perl. Most likely you include some module that prints 0 in the END/DESTROY block or something like this. You didn't answer whether you have the same problem with the script I've suggested for you to run. If 0 doesn't appear with this 3 liner, see the item above, if the item above doesn't help see the 2nd item above. e.g. I don't see where is your ScriptAlias setting. You cannot run mod_cgi without setting ScriptAlias or using I'm sorry, I forgot to throw in the ScriptAlias with the config block I emailed earlier. I do indeed have a ScriptAlias set to: ScriptAlias /cgi-bin/ /home/www/cgi-bin/ cool _ Stas Bekman JAm_pH -- Just Another mod_perl Hacker http://stason.org/ mod_perl Guide http://perl.apache.org/guide mailto:[EMAIL PROTECTED] http://ticketmaster.com http://apacheweek.com http://singlesheaven.com http://perl.apache.org http://perlmonth.com/
RE: 0 being appended to non mod_perl scripts.
There are a few scripts that use system calls (``). There are scripts that
don't use system calls at all and still have the 0. None of them create any
subprocesses.
I checked to see if mod_perl was handling the scripts that sent the '0' but
perl is indeed handling them and not httpd.
For testing this problem I have a standard setup:
Directory /home/www/cgi-bin
AllowOverride None
Options None
Order allow,deny
Allow from all
Options +ExecCGI
/Directory
The mod_perl script directory:
Directory /home/www/perl
SetHandler perl-script
PerlHandler Apache::Registry
Options +ExecCGI
PerlSendHeader on
PerlModule Apache::DBI Apache::StatINC
AllowOverride All
/Directory
The server is running Apache 1.3.20. I'm not sure how to find the version
of mod_perl...
Nothing looks out of wack does it? Anything running in cgi-bin has a '0'
appended to it and is exceuted by perl. Anything in perl does not have the
'0' and is executed by httpd.
- Mike
-Original Message-
From: darren chamberlain [mailto:[EMAIL PROTECTED]]
Sent: Thursday, March 21, 2002 11:49 AM
To: [EMAIL PROTECTED]
Subject: Re: 0 being appended to non mod_perl scripts.
Quoting Mike Wille [EMAIL PROTECTED] [Mar 21, 2002 11:36]:
I apologize if this has already been answered elsewhere, I
haven't been able to find it.
I am encountering a wierd problem where perl scripts running
under a normal cgi-bin (ie no mod_perl) have a '0' appended to
the output. This does not happen to scripts run under
mod_perl. It also only happens when PerlSendHeader is set to
on. I thought that PerlSendHeader was a mod_perl only
directive, but just to check I added PerlSendHeader off to the
cgi-bin directory. That had no effect.
Has anyone else encountered this and how did you fix it?
This looks like an exit code to me. Does the script create
subprocesses or use system? Also, if PerlSendHeader is making
the script behave differently, it sounds like mod_perl is
handling your script (you can check for $ENV{MOD_PERL}).
(darren)
--
People who are willing to give up freedom for the sake of short
term security, deserve neither freedom nor security.
-- Ben Franklin
RE: 0 being appended to non mod_perl scripts.
Hi there, On Thu, 21 Mar 2002, Mike Wille wrote: [snip,snip] I checked to see if mod_perl was handling the scripts that sent the '0' but perl is indeed handling them and not httpd. I'm not sure I understand what you're saying here. The server is running Apache 1.3.20. I'm not sure how to find the version of mod_perl... Does this mean you'vve *never* looked in the error_log??? 73, Ged.
Re: 0 being appended to non mod_perl scripts.
Mike Wille wrote:
There are a few scripts that use system calls (``). There are scripts that
don't use system calls at all and still have the 0. None of them create any
subprocesses.
I checked to see if mod_perl was handling the scripts that sent the '0' but
perl is indeed handling them and not httpd.
As Darren has suggested please try this script:
#!/usr/bin/perl -wT
print Content-type: text/plain\n\n;
print Running under ;
print $ENV{MOD_PERL} ? mod_perl : mod_cgi;
and if you get mod_perl, and you don't know to figure out why, start
from scratch, remove all configs you have added to the default
httpd.conf and then start adding one by one and see what you are doing
wrong.
e.g. I don't see where is your ScriptAlias setting. You cannot run
mod_cgi without setting ScriptAlias or using
SetHandler default-handler
for example see:
http://perl.apache.org/guide/config.html#Overriding_Location_Setting_in
and the rest of the chapter
For testing this problem I have a standard setup:
Directory /home/www/cgi-bin
AllowOverride None
Options None
Order allow,deny
Allow from all
Options +ExecCGI
/Directory
The mod_perl script directory:
Directory /home/www/perl
SetHandler perl-script
PerlHandler Apache::Registry
Options +ExecCGI
PerlSendHeader on
PerlModule Apache::DBI Apache::StatINC
AllowOverride All
/Directory
The server is running Apache 1.3.20. I'm not sure how to find the version
of mod_perl...
Nothing looks out of wack does it? Anything running in cgi-bin has a '0'
appended to it and is exceuted by perl. Anything in perl does not have the
'0' and is executed by httpd.
- Mike
-Original Message-
From: darren chamberlain [mailto:[EMAIL PROTECTED]]
Sent: Thursday, March 21, 2002 11:49 AM
To: [EMAIL PROTECTED]
Subject: Re: 0 being appended to non mod_perl scripts.
Quoting Mike Wille [EMAIL PROTECTED] [Mar 21, 2002 11:36]:
I apologize if this has already been answered elsewhere, I
haven't been able to find it.
I am encountering a wierd problem where perl scripts running
under a normal cgi-bin (ie no mod_perl) have a '0' appended to
the output. This does not happen to scripts run under
mod_perl. It also only happens when PerlSendHeader is set to
on. I thought that PerlSendHeader was a mod_perl only
directive, but just to check I added PerlSendHeader off to the
cgi-bin directory. That had no effect.
Has anyone else encountered this and how did you fix it?
This looks like an exit code to me. Does the script create
subprocesses or use system? Also, if PerlSendHeader is making
the script behave differently, it sounds like mod_perl is
handling your script (you can check for $ENV{MOD_PERL}).
(darren)
--
People who are willing to give up freedom for the sake of short
term security, deserve neither freedom nor security.
-- Ben Franklin
--
_
Stas Bekman JAm_pH -- Just Another mod_perl Hacker
http://stason.org/ mod_perl Guide http://perl.apache.org/guide
mailto:[EMAIL PROTECTED] http://ticketmaster.com http://apacheweek.com
http://singlesheaven.com http://perl.apache.org http://perlmonth.com/
Re: 0 being appended to non mod_perl scripts.
Mike == Mike Wille [EMAIL PROTECTED] writes: Mike I am encountering a wierd problem where perl scripts running under a normal Mike cgi-bin (ie no mod_perl) have a '0' appended to the output. I've seen this happen when people mistakenly write: print system foo; instead of print `foo`; but of course they should have written: system foo; instead. As to why it's not happening in an Apache::Registry script, I cannot say. -- Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095 [EMAIL PROTECTED] URL:http://www.stonehenge.com/merlyn/ Perl/Unix/security consulting, Technical writing, Comedy, etc. etc. See PerlTraining.Stonehenge.com for onsite and open-enrollment Perl training!
