# File lib/active_support/vendor/memcache-client-1.7.4/memcache.rb, line 768
  def cache_incr(server, cache_key, amount)
    with_socket_management(server) do |socket|
      socket.write "incr #{cache_key} #{amount}#{noreply}\r\n"
      break nil if @no_reply
      text = socket.gets
      raise_on_error_response! text
      return nil if text == "NOT_FOUND\r\n"
      return text.to_i
    end
  end