```
public interface WebSocketUpgradeResponse
```
Represents an upgrade response for a WebSocket upgrade request. Can either be valid, in which case the chosenSubprotocol method is valid, or if invalid, the invalidationReason method can be used to find out why the upgrade failed.

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`java.util.Optional<java.lang.String>`	`chosenSubprotocol()`	If valid, returns `Some(subprotocol)` (if any was requested), or `None` if none was chosen or offered.
`java.lang.String`	`invalidationReason()`	If invalid, the reason why the server's upgrade response could not be accepted.
`boolean`	`isValid()`
`HttpResponse`	`response()`	Returns the response object as received from the server for further inspection.

Interface WebSocketUpgradeResponse