[apidoc]

All blogs and howtos only describe the change of API Access with new versions, but not how to handle different backend data versions.

One way is to use the newest version in Client and the Server has to convert old Data to new Data, then deliver to Client. But sometimes it not so easy, depend on complexity of your data.

Other way: convert all Data to new Version and change Data-Access in the old Api Version (but here is the Problem with: never change a running system, things that work before could go wrong). And if you have a huge site with many users, it is not possibly to interrupt the service.

To maintain many versions is for a short period ok, but for longer usage not practicable.

Did somebody have experience with that ?