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use HTTP::Request::Common qw( POST );

...
  Content_Type => 'multipart/form-data',
       Content => [ 'file' => [ $ballot_file ]]
);

use HTTP::Request::Common qw( POST );

...
        name   => 'datafile',
    ],
);

  POST 'http://www.perl.org/survey.cgi',
       Content_Type => 'form-data',
...
                         born   => '1964',
                         init   => ["$ENV{HOME}/.profile"],
                       ]