# File lib/oauth2/strategy/assertion.rb, line 50
      def build_request(params)
        assertion = build_assertion(params)
        {
          :grant_type     => 'assertion',
          :assertion_type => 'urn:ietf:params:oauth:grant-type:jwt-bearer',
          :assertion      => assertion,
          :scope          => params[:scope],
        }
      end