POST /

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

Action=ProvisionIpamPoolCidr&Cidr=__Cidr__&CidrAuthorizationContext.Message=__Message__&CidrAuthorizationContext.Signature=__Signature__&ClientToken=__ClientToken__&DryRun=true&IpamExternalResourceVerificationTokenId=__IpamExternalResourceVerificationTokenId__&IpamPoolId=__IpamPoolId__&NetmaskLength=1&VerificationMethod=remarks-x509&Version=2016-11-15