################################################################################
    # Fetch a URI, using HTTP GET unless you supply <tt>post</tt>.
    def fetch (uri, post={}, headers={})
      @session.refresh
      uri = URI.parse(@session.absolute_uri(uri))

      post.empty? and cached = @cache.check(uri)
      @log.info((cached ? 'C ' : 'N ') + uri.to_s) if @log

      return cached if cached
      sleep(@delay) if @delay != 0

      path = uri.path.dup
      path << "/" if path.empty?
      path << "?" + uri.query if uri.query

      req = post.empty? ? Net::HTTP::Get.new(path) : Net::HTTP::Post.new(path)
      req.set_form_data(post) unless post.empty?

      req['Cookie'] = @session.cookies.to_header
      headers.each {|k,v| req[k] = v}

      res = Net::HTTP.new(uri.host, uri.port).start {|http| http.request(req)}

      if @verbose >= 2
        puts "-----------------------------------------------"
        puts res.class
        res.each_header {|k,v| puts "#{k}: #{v}"}
      end

      # FIXME, what to do about more than one cookie
      @session.cookies.from_header(res['set-cookie']) if res.key?('set-cookie')

      case res
      when Net::HTTPRedirection : res = fetch(res['location'], {}, headers)
      else
      end

      post.empty? and @cache.update(uri, res.body)
      res
    end