begin_transport

# File lib/net/http.rb, line 1451
    def begin_transport(req)
      if @socket.closed?
        connect
      elsif @last_communicated && @last_communicated + @keep_alive_timeout < Time.now
        D 'Conn close because of keep_alive_timeout'
        @socket.close
        connect
      end

      if not req.response_body_permitted? and @close_on_empty_response
        req['connection'] ||= 'close'
      end

      host = req['host'] || address
      host = $1 if host =~ /(.*):\d+$/
      req.update_uri host, port, use_ssl?

      req['host'] ||= addr_port()
    end