# File lib/active_support/vendor/memcache-client-1.5.1/memcache.rb, line 659
  def request_setup(key)
    raise MemCacheError, 'No active servers' unless active?
    cache_key = make_cache_key key
    server = get_server_for_key cache_key
    raise MemCacheError, 'No connection to server' if server.socket.nil?
    return server, cache_key
  end