# File lib/oauth/client/helper.rb, line 52
    def signature_base_string(extra_options = {})
      OAuth::Signature.signature_base_string(@request, { :uri        => options[:request_uri],
                                                         :consumer   => options[:consumer],
                                                         :token      => options[:token],
                                                         :parameters => oauth_parameters}.merge(extra_options) )
    end