The absence of use HTTP::Status causes this error:

use strict;
use warnings;
#use HTTP::Status;
my $x = HTTP::Status::RC_PERMANENT_REDIRECT;
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This is because these "constants" are injected dynamically (via eval) into the module as part of initialisation code in HTTP::Status, see:

# https://metacpan.org/release/HTTP-Message/source/lib/HTTP/Status.pm
# v 6.29
my $mnemonicCode = '';
my ($code, $message);
while (($code, $message) = each %StatusCode) {
    # create mnemonic subroutines
    $message =~ s/I'm/I am/;
    $message =~ tr/a-z \-/A-Z__/;
    $mnemonicCode .= "sub HTTP_$message () { $code }\n";
    $mnemonicCode .= "*RC_$message = \\&HTTP_$message;\n";  # legacy
    $mnemonicCode .= "push(\@EXPORT_OK, 'HTTP_$message');\n";
    $mnemonicCode .= "push(\@EXPORT, 'RC_$message');\n";
}
eval $mnemonicCode; # only one eval for speed
die if $@;
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So, a use HTTP::Status is needed. Furthermore, it seems that mnemonics prepended with RC_ are legacy. I assume the proper way to refer to the codes by message/mnemonic is via HTTP_PERMANENT_REDIRECT() (and not by RC_PERMANENT_REDIRECT)

LWP::UserAgent loads HTTP::Status indirectly via use LWP::Protocol;. Has your perl upgrade also included all installed modules?

bw, bliako

We are using OIDCAuth.pm

I cannot immediately find that on CPAN. Could you link to the source, please?

It would also help if you could wrap your error message in <code> ... </code> tags. Thanks.

OIDCAuth.pm will not be available in CPAN.This is own perl script to h
+andle the http authentication.I will share some of the perl modules l
+oading from this script.
package  CastIron::OIDCAuth;

  use strict;
  use warnings;
  use lib '/usr/share/perl5';
  use URI;
  use SOAP::Lite;

  use Apache2::Access ();
  use Apache2::RequestUtil ();
  use CastIron::DBIWrap;
  use Digest::SHA1 qw(sha1_base64);
use Cache::Memcached ();

  use Apache2::Const -compile => qw(OK DECLINED HTTP_UNAUTHORIZED);
  use LWP::UserAgent; - This is the line it is throwing exception for 
+us

We have upgraded to perl 5.28.3 and after ugrading we are seeing the a
+bove exception.Our Previous version of Perl is 5.12.3 there the we do
+not see any issues and http request works fine.
I have list of perlmodules installs but those are very huge and could 
+not find how to attach.
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If you are running your script in a persistent environment like a mod_perl script, you might want to explicitly load HTTP::Status to make sure all the subroutines are explicitly defined:

use HTTP::Status;
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In the long run, LWP::UserAgent should explicitly have use HTTP::Status; in its code as bliako commented, because it uses elements from that module.

Update: The change has found its way into LWP::UserAgent and will be in some release.