class Selenium::Server

def download(required_version = :latest)
  required_version = latest if required_version == :latest
  download_file_name = "selenium-server-#{required_version}.jar"
  return download_file_name if File.exist? download_file_name
  begin
    download_location = available_assets[download_file_name]['browser_download_url']
    released = Net::HTTP.get_response(URI.parse(download_location))
    redirected = URI.parse released.header['location']
    File.open(download_file_name, 'wb') do |destination|
      download_server(redirected, destination)
    end
  rescue StandardError
    FileUtils.rm_rf download_file_name
    raise
  end
  download_file_name
end