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POST $url
POST $url, Header => Value,...
POST $url, $form_ref, Header => Value,...
POST $url, Header => Value,..., Content => $form_ref
POST $url, Header => Value,..., Content => $content

my $attributes = { name => "test.txt", parent => { id => 0 }};

...
      file       => [ "test.txt" ],
   ],
);

[ undef, "test.txt", Content => $file_contents ]