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$filename='testfile';
$req=POST 'https://www.abcd.com/fileUpload.aspx', Content_Type=>'form-
+data',  Content => [file1=>["$filename"],file4=>[""],file5=>[""]];

--xYzZY
...
--xYzZY
Content-Disposition: form-data; name="file5" filename=""

--xYzZY
Content-Disposition: form-data; name="file1"; filename="testfile "
...

--xYzZY
Content-Disposition: form-data; name="file5"