gem 'aria2'

  # create a client instance
  client = Aria2::Client.new(host: 'localhost', port: 6800)
  client.addUri 'http://example.com/images/1.jpg', 'http://example.com/images/2.jpg'
  # or
  client.add_uri 'http://example.com/images/1.jpg', 'http://example.com/images/2.jpg'
  client.xxxx
  ...
  
  # or 
  Aria2.with(host: 'localhost', port: 6800) do |client|
    client.addUri 'http://example.com/images/1.jpg', 'http://example.com/images/2.jpg'
    client.xxxx
    ...
  end

  # or
  Aria2.with(host: 'localhost', port: 6800) do
    addUri 'http://example.com/images/1.jpg', 'http://example.com/images/2.jpg'
    xxxx
    ...
  end

  # If you invoke method end with '!', then raise Aria2::Error when json contains 'error' key
  @client = Aria2::Client.new token: 'your_token'
  @client.getVersion!