ConnectionErrorHandler (okhttp-eventsource 4.1.1 API)

```
public interface ConnectionErrorHandler
```
Interface for an object that will be notified when BackgroundEventSource encounters a network error or receives an error response.
This is different from BackgroundEventHandler.onError(Throwable) in two ways:
1. It has the ability to tell BackgroundEventSource to shut down instead of reconnecting.
2. If the server simply ends the stream, the ConnectionErrorHandler is called with an EOFException; onError is not called in this case.

Nested Class Summary

Nested Classes
Modifier and Type	Interface	Description
`static class`	`ConnectionErrorHandler.Action`	Return values of `onConnectionError(Throwable)` indicating what action the `BackgroundEventSource` should take after an error.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`ConnectionErrorHandler.Action`	`onConnectionError(java.lang.Throwable t)`	This method is called synchronously for all exceptions that occur on the socket connection (including a `StreamHttpErrorException` if the server returns an unexpected HTTP status, or `EOFException` if the streaming response has ended).

- Method Detail
  - onConnectionError
```
ConnectionErrorHandler.Action onConnectionError(java.lang.Throwable t)
```
    This method is called synchronously for all exceptions that occur on the socket connection (including a StreamHttpErrorException if the server returns an unexpected HTTP status, or EOFException if the streaming response has ended).
    It must not take any direct action to affect the state of the connection, nor do any I/O of its own, but it can return ConnectionErrorHandler.Action.SHUTDOWN to cause the connection to close.
    
    Parameters:
    
    t - a Throwable object
    
    Returns:
    
    an ConnectionErrorHandler.Action constant