# File lib_core/rucy/response.rb, line 126
    def conn_keep_alive(req_version)
      case (req_version)
      when 'HTTP/1.1'
        delete_header_if('Connection') {|value| value =~ /close/i }
      when 'HTTP/1.0'
        if (has_header? 'Content-Length') then
          delete_header_if('Connection') {|value| value =~ /close/i }
          if (! headers('Connection').find{|v| v =~ /Keep-Alive/i }) then
            set_header('Connection', 'Keep-Alive', true)
          end
        else
          conn_close
        end
      else
        conn_close
      end

      nil
    end