# File lib/ec2/ec2.rb, line 1117
    def describe_availability_zones(list=[])
      link = generate_request("DescribeAvailabilityZones",
                              hash_params('ZoneName', list.to_a))
      request_cache_or_info :describe_availability_zones, link, QEc2DescribeAvailabilityZonesParser, @@bench, list.nil? || list.empty?
    rescue Exception
      on_exception
    end