Hello there kikuchiyo
A big thank you for you testing, now the code is working

The problem was, I was using plackup -L Shotgun to run the psgi app, and the error I was getting was.

Magic number checking on storable string failed at /usr/lib/x86_64-linux-gnu/perl/5.22/Storable.pm line 420, at /usr/local/share/perl/5.22.1/Plack/Loader/Shotgun.pm line 35. Sometimes I get the error memory

But when I change to just plackup, everything works
here is the final code:

use strict;
use warnings;
####use Plack::Response; # doesn't seem to support streaming response

use Path::Tiny;
use File::MimeInfo;

my $app = sub {
   
    my $env = shift;
    my $path_file = 'win.iso';

    my $content_type = mimetype($path_file);
    $content_type = 'application/octet-stream' if not defined $content
+_type;
    

    require File::Spec::Unix;
    my $basename = $path_file;
    $basename =~ s|\\|/|g;
    $basename = ( File::Spec::Unix->splitpath($basename) )[2];
    $basename =~ s|[^\w\.-]+|_|g;

    return sub {
       my $responder = shift;
        my $writer = $responder->(
            [ 200, [
                   'Content-Type' => $content_type,
                   'Content-Disposition' => qq[attachment; filename="$
+basename"],
               ]
            ]
        );

        open (FILE, "< $path_file") or die "can't open $path_file: $!"
+;
        binmode FILE;
        local $/ = \102400;
        while (<FILE>) {
            $writer->write($_);
        }
        $writer->close();
        close FILE;
    }
}
[download]

again thank you so much for your time and your code

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