problems assembling POST HTTP::Request

[cerr]

Hi,

I'm trying to post a filename (that generally comes out of a html
<input type="file" box) to a perl script out of my perl script that
should pretend as if it was done by hand on the webpage...
The code POST request i came up with looks like this:

my $post = HTTP::Request->new(POST => $PostPage,
Content_Type => 'form-data',
Content => [ filename => 'file://mnt/ENGINEERING/Docs/Tropos/
pAce34-7.1.2.3-5189k-efs.bin',
]);

but when i execute it i get:

Bad header argument at ./upgrdeFrmwr.pl line 50

Where line 50 is the first line of my POST request... I do'nt
understand, what kind of header argument may I require?

Thanks for hints and ideas!
Ron