Response header name ' Content- type' contains invalid characters, after running a Perl_CGI script.

Hello ! Everyone, I am back here again to get your help.
But I will try to help others in another way, so please generous.
O.K. let me get started. I got weird error message as shown at the title, while I am reviewing the error_log at /var/log/httpd/ error_log. I never encountered this error message, so I can't figure the point of the error message. Does anyone has any clue to fix this error?

I will post the references.
==== httpd error_log about 10 lines =============…

Require in Perl, what should I pay attention?

Hi ! Everyone there ! How are you ?

After the movement a pair of Perl scripts (script_main.pl and script_sub.pl), in which I integrated the minor script_sub.pl into the main part (script_main.pl) by using "require".

In the main script_main.pl, I just inserted the following line,

require 'script_sub.pl';

By this way, two scripts worked as if one. While Perl version was 5.8…

How to change charset=ISO-8859-1 to charset=UTF8? Rocky 9.1 server

Hi ! Everyone, I am back here to ask environmental issue.

Perl Script, check.pl
#!/usr/bin/env perl
use strict;
use warnings;
use CGI;

my $q = CGI->new;
print $q->header();
print "OK";

===================
OUTPUT
mkido@localhost$check.pl [Enter to run it.]
Content-Type: text/html; charset…

The first line of Perl_CGI script, env perl vs perl only, how different?

Hi ! Everyone there ! How are you ?

Until recently I runs all of my Perl scripts as well as Perl_CGI scripts by starting the folowing salutation,

#! /usr/bin/perl -w

The script with this beginning runs well at BASH shell at (/home/mkido/bin) LINUX such as Fedora, Ubuntu, Rocky (Alma-derivative). However, almost right now I noticed some of Perl example around has the different first line as below,

#! /usr/bin/env perl

And it doesn't seem to run at HOME BASH shell (/home/mkido/bin) by simple way of executing it by-itself by the command line. Wil…

Moving from Perl_5.8.8 (2007) TO Perl_5.36.0 (2022)

Hi ! Everyone, here is a quick question.

As for the CGI script, the first line was

#! /usr/bin/perl -w

Is it not good enough to evoke PERL program at current Perl_5_36.0 (2022)??
If it is not good enough, let me know how should I write at the first line of CGI script???

Thanks !