500 errors

[pjcs00]

Maybe it's too obvious to include, but my first response to a 500 error is:

perl -cw app.pl

Most of my scripts use $ENV{DOCUMENT_ROOT} or other environment variables, so this works better:

export DOCUMENT_ROOT=/path/to/website/root perl -cw app.pl

[szabgab]

Thanks for the suggestions. What kind of issues does this catch for you?

[pjcs00]

Hi Gabor

I use 'perl -cw' to find anything that gets caught by the compiler - missing semicolons, mismatched brackets, undeclared variables, scope problems, missing 'use' or 'require' and so on. When making a small change to a working script it's tempting just to upload it (to a test instance of the site) and hope for the best, but a quick 'perl -cw' at least ensures that it will syntax check.

It's a lot easier and quicker reading the output from the Perl compile phase than deciphering the server log. My main hosting service has switched from Apache to Nginx, which has a much less readable log file.

It's also the case that warnings generated by a webpage don't always appear in the log file, and even if they do, you probably wouldn't notice them.

Peter

On Wed, 2 Mar 2022 at 04:19, Gabor Szabo @.***> wrote:

Thanks for the suggestions. What kind of issues does this catch for you?

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