# File lib/oauth/client/helper.rb, line 44
    def signature(extra_options = {})
      OAuth::Signature.sign(@request, { :uri      => options[:request_uri],
                                        :consumer => options[:consumer],
                                        :token    => options[:token],
                                        :unsigned_parameters => options[:unsigned_parameters]
      }.merge(extra_options) )
    end