I use upload function from MediaWiki::API Module (http://search.cpan.org/~exobuzz/MediaWiki-API-0.27/lib/MediaWiki/API.pm) in a subroutine:

sub up_file {
    my ($api, $name, $url, $sum, $reupload) = @_;
    
    my $res = $api->api({
        action => 'query',
        prop => 'info',
        titles => $name
    }) || return $api->{error}->{details};
    my $missing = exists((values %{$res->{query}->{pages}})[0]->{missi
+ng});

    my $ua = LWP::UserAgent->new( timeout => 25 );
    my $response = $ua->get($url);
    $response = $response->decoded_content if($response->is_success())
+;
    
    if((!$missing && $reupload) || $missing) {
        $api->edit({
            action => 'upload',
            filename => $name,
            comment => $sum,
            text => $sum,
            file => $response,
            ignorewarnings => 1
        }) || return 'Error with upload file ' . $name . ': ' . $api->
+{error}->{details};
        return 'done';
    }
    return 'File ' . $name . ' exist and $reupload is undefined';
}
[download]

$api is MediaWiki::API object, defined in main programm.

$name is full in-wiki filename like 'File:Example.jpg'.

$url is a real URL like 'http://example.com/1.jpg' to download file and send content to $api->upload() function.

$sum is a comment to uploading.

if $reupload is defined, this function can reupload exist file.

And this function with all correct variables return "HTTP::Message content must be bytes at /usr/local/share/perl/5.10.0/HTTP/Request/Common.pm line 91".

All perl modules is up to date.

How to resolve this problem?