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Re: use CGI or die;

by ColonelPanic (Friar)
on Jan 12, 2001 at 02:08 UTC ( #51225=note: print w/replies, xml ) Need Help??

in reply to use CGI or die;

Another huge debugging benefit of CGI is CGI::Carp
use CGI::Carp qw(fatalsToBrowser);
This is invaluable for figuring out a CGI problem. Not only do you see errors, but you can easily insert your own die(); statements to see what's going on, instead of printing your own header and HTML in several lines.

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Re: Re: use CGI or die;
by davorg (Chancellor) on Jan 12, 2001 at 15:09 UTC

    But you don't need to be using CGI in order to make use of CGI::Carp.


    "Perl makes the fun jobs fun
    and the boring jobs bearable" - me

Re: use CGI or die;
by epoptai (Curate) on Jan 14, 2001 at 12:38 UTC
    I always use strict, -w and fatalsToBrowser when developing, but today this caused me a huge headache in a simple script (with no syntax errors) that merely reads a file, formats the contents, and displays the html.

    It runs fine from the command line (with a few uninitialized value warnings) and could save the output with

    perl > foo.html
    but it would just whirl and give no output via CGI. I found that the code looks and behaves perfectly via CGI unless both -w and fatalsToBrowser are enabled! Shut either one off (leaving the other on) and it works fine.

    I found a certain loop in the program that seems to cause this by throwing pairs of =cut around, but the loop seems mundane and similar to the others.

    Is this odd interplay between -w and fatalsToBrowser documented?

    Update: I said i'd node the entire script to craft in a day or two but am finding it difficult to abstract a simplified example. So i'll just suggest that if your error-free cgi script mysteriously hangs, turning off either -w or fatalsToBrowser may help.

    dws - Try this for a good html ™:

      Show us the code!

      Enquiring Monks Want to Know™

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