# File lib/active_support/vendor/memcache-client-1.7.4/memcache.rb, line 681
  def cache_get(server, cache_key)
    with_socket_management(server) do |socket|
      socket.write "get #{cache_key}\r\n"
      keyline = socket.gets # "VALUE <key> <flags> <bytes>\r\n"

      if keyline.nil? then
        server.close
        raise MemCacheError, "lost connection to #{server.host}:#{server.port}"
      end

      raise_on_error_response! keyline
      return nil if keyline == "END\r\n"

      unless keyline =~ /(\d+)\r/ then
        server.close
        raise MemCacheError, "unexpected response #{keyline.inspect}"
      end
      value = socket.read $1.to_i
      socket.read 2 # "\r\n"
      socket.gets   # "END\r\n"
      return value
    end
  end