How to handle IoFuture according to different IoFuture.Status

We use Undertow as the client lib for outgoing http connection in our light4j/undertow based microservices.

When calling IoFuture<ClientConnection>.await with a timeout, we want to know how to deal with the IoFuture for each IoFuture statuses.

For examples, is there any document described the information below:

• When the status is WAITING, do we need to cancel the future and does it mean a timeout just happened?
• Is the IoFuture.getException() only available when the status is ERROR and not for others?
• When the status is set to CANCELLED? Does it mean the IoFuture.get() return null? Is there any resource we need to release?