Update to use latest API version by default, or negotiate w/ server

[gschueler]

Some features only work on newer API version with Rundeck. Some clients are running older version of rundeck.

We should keep the "default" API version at the latest supported level. If the server doesn't support that newer version, the User should define RD_URL=http://server/api/X where X is the latest supported version for their server.

Ideally, if using a bare RD_URL=http://server/rundeck URL (without specifying API version), rd should detect the latest supported API version by the Rundeck server and then use the latest specific API version that is commonly supported.

[Alveel]

Hi, sorry for reopening this issue, but it seems the auto-downgrading functionality doesn't properly work.

Using Rundeck 2.3.9 (API version 20) and rundeck-cli 1.0.20, with "export RD_API_DOWNGRADE=true" in rd.conf, I still get
Error: Unsupported API Version "21". API Request: /api/21/project/$project/jobs. Reason: Current version: 20

Setting the RD_URL to include /api/20 works, though 😃

[gschueler]

@Alveel ok, thanks I will try to reproduce it

[gschueler]

@Alveel which version do you have? did you mean 2.9.3?

[Alveel]

@gschueler correct, I am on version 2.9.3-1, sorry :)

[gschueler]

figured ;) I discovered the issue, not all of the api calls were using the same interface to do so, so it wasn't hooking into the downgrade mechanism