POST /

Content-Type: application/x-www-form-urlencoded

Action=CreateSecondarySubnet&AvailabilityZone=__AvailabilityZone__&AvailabilityZoneId=__AvailabilityZoneId__&ClientToken=__ClientToken__&DryRun=true&Ipv4CidrBlock=__Ipv4CidrBlock__&SecondaryNetworkId=__SecondaryNetworkId__&TagSpecification.1.ResourceType=capacity-reservation&TagSpecification.1.Tag.1.Key=__Key__&TagSpecification.1.Tag.1.Value=__Value__&TagSpecification.1.Tag.2.Key=__Key__&TagSpecification.1.Tag.2.Value=__Value__&TagSpecification.2.ResourceType=capacity-reservation&TagSpecification.2.Tag.1.Key=__Key__&TagSpecification.2.Tag.1.Value=__Value__&TagSpecification.2.Tag.2.Key=__Key__&TagSpecification.2.Tag.2.Value=__Value__&Version=2016-11-15