This example uses the steps that are described in the Upload a File from a URL to a Library Item procedure.

require 'Com/Vmware/Content/Library'
require 'Com/Vmware/Content/Library/Item'
require 'Com/Vmware/Content/Library/Item/Updatesession'
require 'securerandom'

# 1 - Create a new library item to hold the uploaded file.
item_model =
   Com::Vmware::Content::Library::ItemModel.new
item_model.name = 'ESXi patches'
item_model.description = 'ESXi 5.5 security patches as of 2/3/2015'
item_model.type = 'iso'
item_model.library_id = $my_library_id
idem_token = SecureRandom.uuid
item_stub =
   Com::Vmware::Content::Library::ItemService.new $my_stub_config
$my_library_item_id = item_stub.create(create_spec=item_model,
                                       client_token=idem_token)

# 2 - Create an UpdateSessionModel instance to track your changes to the item.
update_session_model =
   Com::Vmware::Content::Library::Item::UpdateSessionModel.new
update_session_model.library_item_id = $my_library_item_id

# 3 - Create an update session from the model.
idem_token = SecureRandom.uuid
update_session_stub =
   Com::Vmware::Content::Library::Item::UpdateSession.new $my_stub_config
update_session_id =
   update_session_stub.create(create_spec=update_session_model,
                              client_token=idem_token)

# 4 - Create a new AddSpec instance to describe the properties of
#     the file to be uploaded.
file_spec =
   Com::Vmware::Content::Library::Item::Updatesession::File::AddSpec.new
file_spec.name = 'ESXi patch as of 10/2/2015'
file_spec.source_type =
 Com::Vmware::Content::Library::Item::Updatesession::File::SourceType::PULL

# 5 - Specify the location from which the file is to be uploaded.
endpoint =
   Com::Vmware::Content::Library::Item::TransferEndpoint.new
endpoint.uri = 'http://www.example.com/patches_ESXi55/ESXi_patch.iso'
file_spec.source_endpoint = endpoint

# 6 - Link the file specification to the update session.
update_file_stub =
   Com::Vmware::Content::Library::Item::Updatesession::File.new(
      $my_stub_config )
update_file_stub.add(update_session_id=update_session_id,
                     file_spec=file_spec)

# 7 - Mark session as completed, to initiate the asynchronous transfer.
update_session_stub.complete update_session_id