source_rss.rb

    class Response
      def initialize(source_uri)
        @source_uri = source_uri
        @last_response = nil
      end
      
      def http_response_for(uri)
        Net::HTTP.start(uri.host, uri.port) do |http|
          @last_response = http.get(path_for(uri), 'User-Agent' => user_agent)
        end
      end
      
      def path_for(uri)
        uri.query.nil? ? uri.path : "#{uri.path}?#{uri.query}"
      end
      
      def valid?
        # uri = @source_uri
        # 
        # while (response = http_response_for(uri).is_a?(Net::HTTPSuccess))
        #   uri = response['location']
        # end
        # 
        # @last_response.is_a?(Net::HTTPSuccess)
      end
    end


    def response
      @response ||= Response.new(source)
    end
    
    def exists?
      response.valid?
    end