# File lib/oauth/client/helper.rb, line 53
    def header
      parameters = oauth_parameters
      parameters.merge!('oauth_signature' => signature(options.merge(:parameters => parameters)))

      header_params_str = parameters.map { |k,v| "#{k}=\"#{escape(v)}\"" }.join(', ')

      realm = "realm=\"#{options[:realm]}\", " if options[:realm]
      "OAuth #{realm}#{header_params_str}"
    end