So, I don't use CGI a lot much these days. But I recently wrote a little joke module and decided to make a little HTML form interface for it. Plack would be a sensible way of doing the interface, but this was just a silly little thing and I was feeling lazy, so I coded it up using CGI instead. I'd used Moo rather than Moose so speed shouldn't have been an issue.

I uploaded it to the server and visited the page and it just showed me my Perl source code. Hmmm…

Create .htacccess and add the following lines:

Options +ExecCGI
AddHandler cgi-script .cgi .pl

[download]

Visit the page again… still showing the source code. Hmmm…

Scratch head for five minutes. Open up httpd.conf, add:

<Directory /path/to/my/vhost/>
  AllowOverride all
</Directory>

[download]

Visit the page again… still showing the source code. Hmmm…

SSH into the server and run ./myscript.cgi from the command line.

"uniq" is not exported by the List::Util module

[download]

Okay, I must have an old version of it. Upgrade.

Visit the page again… still showing the source code. Hmmm…

Stop using List::Util entirely.

sub uniq {
  my %seen;
  grep !$seen{$_}++, @_;
}

[download]

Visit the page again… still showing the source code. Hmmm…

Scratch head for ten minutes. Rename to ./myscript.pl.

Visit the page again… still showing the source code. Hmmm…

Create the following file and mark it as executable:

#!/bin/sh
echo "Content-Type: text/plain";
echo "";
echo "Hello world";

[download]

Visit my new page… also showing the source code. Hmmm…

Scratch head some more.

Consider buying anti-headlice shampoo.

Finally… FINALLY… after about TWO HOURS I figure out the problem! It was…

<Reveal this spoiler or all in this thread>

In reply to How easy it is to make mistakes by tobyink

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