# File lib/ec2/right_ec2.rb, line 978
    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.blank?
    rescue Exception
      on_exception
    end