test.cgi

#!/usr/bin/perl

use strict;
use warnings;

use feature ':5.10';

use local::lib;

use Carp;
use Data::Dumper;
use Mojolicious::Lite -signatures;

get '/' => sub ($c) {
  $c->app->log->debug('f00bar'); # I'm trying to figure out where this would log to.
  $c->render(text => "Mode: " . app->mode);
};

get('/foo' => sub ($c) {
  $c->render(text => 'Foo Bar');
});

app->start();

sub getDir {
  opendir(my $DH, '.') || croak('Unable to open directory.');

  my @files = readdir($DH);

  return @files;
}

After doing some digging, it's probably going to STDERR.

bless( {
  "color" => undef,
  "events" => {
    "message" => [
      sub { "DUMMY" }
    ]
  },
  "format" => sub { "DUMMY" },
  "handle" => \*::STDERR,
  "history" => [
    [
      "1681576990.14162",
      "trace",
      "[sRFzdhZls5kM]",
      "GET \"/log\""
    ],
    [
      "1681576990.14244",
      "trace",
      "[sRFzdhZls5kM]",
      "Routing to a callback"
    ]
  ],
  "level" => "trace",
  "max_history_size" => 10,
  "short" => undef
}, 'Mojo::Log' )

...is a nice rendition of:

get('/log' => sub ($c) {
  $c->render(text => "<pre>\n" . $c->dumper($c->app->log) . "</pre>");
});