class Aws::Plugins::UserAgent::Handler::UserAgent

def app_id_metadata
  return unless (app_id = @context.config.sdk_ua_app_id)
  # Sanitize and only allow these characters
  app_id = app_id.gsub(/[^!#$%&'*+\-.^_`|~0-9A-Za-z]/, '-')
  "app/#{app_id}"
end