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use strict;
use warnings;
...
    $response->body($content_download);
    return $response->finalize;
}

open (FILE, "< $path_file") or die "can't open $path_file: $!";
binmode FILE;
...
    return $response->finalize;
}
close FILE;

use IO::Handle;

...
close $fh;

return $response->finalize;