RS Cloud Ruby Upload; Trying to set headers

rs_cloud.rb

require 'cloudfiles'

cf = CloudFiles::Connection.new( :username => 'turbovote', :api_key => '[hidden]' )
container = cf.container('forms-test')
object = container.create_object('test.pdf')
file_path = File.join("/", "tmp", "test.pdf")
headers = {
  'content-type' => "application/pdf",
  'content-disposition' => "attachment; filename=public_name.pdf",
  'access-control-allow-origin' => "*"
}
object.write(File.open(file_path), headers)
object.set_metadata('expires_on' => 'dummy')