Hi, I've setup a server and installed HestiaCP as a server management tool to install & control NGINX, Apache, Databases, .... It's an Ubuntu 22.04 server Unfortunately HestiaCP doesn't support Perl, so I installed the package for Mod_Perl myself and changed the Apache configuration accordingly. Now I started migrating stuff from my old webhoster to the new server. And... now I'm facing lots of problems. The problems seem to only occur when I use self-written modules. Using pre-existing modules doesn't cause any problems. The scripts and modules were running perfectly fine on my old webhoster. I just needed to change a few paths in the scripts/modules to refelct the new locations. So I am pretty sure that I do not have a syntax error or something like that. Around 50% of the time I can see in the web server log messages like these:

2023/02/24 14:36:45 [error] 1467#1467: *1180 upstream prematurely clos
+ed connection while reading response header from upstream, client: 87
+.122.231.239, server: digioso.tk, request: "GET /test.pl HTTP/2.0", u
+pstream: "https://10.0.0.113:8443/test.pl", host: "digioso.tk"
[download]

So... 50% of the time the page loads, 50% it doesn't. The upstream errors point to NGINX (at least all the search results I found on Google point there), but I couldn't find anything even remotely connected to my issue.

Links to test:
https://digioso.tk/test.pl <- I am using a self-writte module here and the issue occurs like 50% of the time. The website runs into error 500 and I can see the above upstream message in my webserver logfile. If you don't get error 500 immediately - please refresh the page a couple of times.
https://digioso.tk/test2.pl <- No self-written modules. Runs perfectly fine.

Source code:
test.pl

#!/usr/bin/perl -w
use strict;
use CGI;
use CGI::Carp qw(fatalsToBrowser warningsToBrowser);
use lib "/home/digioso/web/digioso.tk/stuff";
use Navi;

Navi::print_navi();
print "test";
Navi::end_navi();
[download]

test2.pl

#!/usr/bin/perl -w
use strict;
use CGI;
use CGI::Carp qw(fatalsToBrowser warningsToBrowser);
my $cgi = new CGI;
binmode STDOUT, ":utf8";
print $cgi->header (-type => 'text/html', -charset => 'UTF-8');
print "test2";
print $cgi->end_html;
[download]

Navi.pm (located in /home/digioso/web/digioso.tk/stuff):

#!/usr/bin/perl -w

use strict;
use warnings;
use CGI;
use CGI::Carp qw(fatalsToBrowser warningsToBrowser);

package Navi;

my $cgi = new CGI;
binmode STDOUT, ":utf8";

sub print_navi
{
    print $cgi->header (-type => 'text/html', -charset => 'UTF-8');
}

sub end_navi()
{
    print $cgi->end_html;
}
[download]

So basically test1 outputs the same as test2. Only difference is that starting and ending HTML is done via a module. The original Navi.pm contains many more things (eg including CSS and so on), but for demonstration purposes I thinned it down to the above.

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