# File lib/fog/aws/requests/auto_scaling/create_launch_configuration.rb, line 54
        def create_launch_configuration(image_id, instance_type, launch_configuration_name, options = {})
          if block_device_mappings = options.delete('BlockDeviceMappings')
            block_device_mappings.each_with_index do |mapping, i|
              for key, value in mapping
                options.merge!({ format("BlockDeviceMappings.member.%d.#{key}", i+1) => value })
              end
            end
          end
          if security_groups = options.delete('SecurityGroups')
             options.merge!(AWS.indexed_param('SecurityGroups.member.%d', [*security_groups]))
          end
          if options['UserData']
            options['UserData'] = Base64.encode64(options['UserData'])
          end
          request({
            'Action'                  => 'CreateLaunchConfiguration',
            'ImageId'                 => image_id,
            'InstanceType'            => instance_type,
            'LaunchConfigurationName' => launch_configuration_name,
            :parser                   => Fog::Parsers::AWS::AutoScaling::Basic.new
          }.merge!(options))
        end