# File lib/memcache.rb, line 643
  def make_cache_key(key)
    if @autofix_keys and (key =~ /\s/ or (key.length + (namespace.nil? ? 0 : namespace.length)) > 250)
      key = "#{Digest::SHA1.hexdigest(key)}-autofixed"
    end

    if namespace.nil? then
      key
    else
      "#{@namespace}:#{key}"
    end
  end