Well you are half right. You should do BOTH. I version by doing v0.1–1.

0.1 for the APP

Dash 1 for the api state

That way at the load balancer it will tell it which server to go to and which version of the api state to load. Easy peasy.

And yes, we load it in the URI because headers are not always passed which is why URI’s are the best way to do this.