Hi, The json response of deployvirtualmachine - 4.1-SNAPSHOT contains now a variable "cloudstack-version".
2013-01-28 20:31:42,796 | DEBUG | user thread 0 | AsyncRestClientProxy | clouds.logging.log4j.Log4JLogger 60 | 115 - jclouds-log4j - 1.5.3 | Invoking VirtualMachineAsyncClient.deployVirtualMachineInZone 2013-01-28 20:31:42,798 | DEBUG | i/o thread 0 | avaUrlHttpCommandExecutorService | clouds.logging.log4j.Log4JLogger 60 | 115 - jclouds-log4j - 1.5.3 | Sending request -546853376: GET http://localhost:8080/client/api?response=json&command=deployVirtualMachine&zoneid=320d876d-741c-4e71-9a1c-5a9e7838dd50&templateid=5c0b75a8-6927-11e2-a8a4-5c260a0287e9&serviceofferingid=ee9d812e-dd25-4e8f-83ed-1d0d22f39b5b&displayname=fabric-30a&name=fabric-30a&apiKey=EqYwkeuZnxxdkx-HnFOkCN5KkfCWyypfX5KVcX37116twCOXBau0QUWYB4pjHd8RyHn7kDP_rZnwGkpQWD4Qxg&signature=PF18u%2BqF%2FgOZyPN%2FpfR2VPyOlwY%3DHTTP/1.1 2013-01-28 20:31:42,799 | DEBUG | i/o thread 0 | headers | clouds.logging.log4j.Log4JLogger 60 | 115 - jclouds-log4j - 1.5.3 | >> GET http://localhost:8080/client/api?response=json&command=deployVirtualMachine&zoneid=320d876d-741c-4e71-9a1c-5a9e7838dd50&templateid=5c0b75a8-6927-11e2-a8a4-5c260a0287e9&serviceofferingid=ee9d812e-dd25-4e8f-83ed-1d0d22f39b5b&displayname=fabric-30a&name=fabric-30a&apiKey=EqYwkeuZnxxdkx-HnFOkCN5KkfCWyypfX5KVcX37116twCOXBau0QUWYB4pjHd8RyHn7kDP_rZnwGkpQWD4Qxg&signature=PF18u%2BqF%2FgOZyPN%2FpfR2VPyOlwY%3DHTTP/1.1 2013-01-28 20:31:42,799 | DEBUG | i/o thread 0 | headers | clouds.logging.log4j.Log4JLogger 60 | 115 - jclouds-log4j - 1.5.3 | >> Accept: application/json 2013-01-28 20:31:43,187 | DEBUG | i/o thread 0 | avaUrlHttpCommandExecutorService | clouds.logging.log4j.Log4JLogger 60 | 115 - jclouds-log4j - 1.5.3 | Receiving response -546853376: HTTP/1.1 200 OK 2013-01-28 20:31:43,187 | DEBUG | i/o thread 0 | headers | clouds.logging.log4j.Log4JLogger 60 | 115 - jclouds-log4j - 1.5.3 | << HTTP/1.1 200 OK 2013-01-28 20:31:43,188 | DEBUG | i/o thread 0 | headers | clouds.logging.log4j.Log4JLogger 60 | 115 - jclouds-log4j - 1.5.3 | << Server: Jetty(6.1.26) 2013-01-28 20:31:43,188 | DEBUG | i/o thread 0 | headers | clouds.logging.log4j.Log4JLogger 60 | 115 - jclouds-log4j - 1.5.3 | << Content-Type: text/javascript; charset=UTF-8 2013-01-28 20:31:43,189 | DEBUG | i/o thread 0 | headers | clouds.logging.log4j.Log4JLogger 60 | 115 - jclouds-log4j - 1.5.3 | << Content-Length: 169 2013-01-28 20:31:43,189 | DEBUG | i/o thread 0 | wire | clouds.logging.log4j.Log4JLogger 60 | 115 - jclouds-log4j - 1.5.3 | << "{ "deployvirtualmachineresponse" : {"id":"1cce6cb7-2268-47ff-9696-d9e610f6619a","jobid":"13330fc9-8b3e-4582-aa3e-90883c041ff0"}, "cloudstack-version": "4.1.0-SNAPSHOT" }" As I don't see it in the doc here ( http://incubator.apache.org/cloudstack/docs/api/apidocs-4.0.0/TOC_User.html), can somebody confirms that this is new feature not yet published in the doc ? Can we disable it to be compatible with CloudStack 3.0 API ? Regards, -- Charles Moulliard Apache Committer / Sr. Enterprise Architect (RedHat) Twitter : @cmoulliard | Blog : http://cmoulliard.blogspot.com