UnhandledExceptionHandler (mu-server 2.1.20 API)

```
public interface UnhandledExceptionHandler
```
A handler for exceptions that have been thrown by other handlers which allows for custom error pages.
This is registered with MuServerBuilder.withExceptionHandler(UnhandledExceptionHandler).

Note: RedirectionExceptions will not get routed to this handler.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`handle(MuRequest request, MuResponse response, java.lang.Throwable cause)`	Called when an exception is thrown by another handler.

- Method Detail
  - handle
```
boolean handle(MuRequest request,
               MuResponse response,
               java.lang.Throwable cause)
        throws java.lang.Exception
```
    Called when an exception is thrown by another handler.
    Note that if the response has already started sending data, you will not be able to add a custom error message. In this case, you may want to allow for the default error handling by returning false.
    
    The following shows a pattern to filter out certain errors:
    
    muServerBuilder.withExceptionHandler((request, response, exception) -> { if (response.hasStartedSendingData()) return false; // cannot customise the response if (exception instanceof NotAuthorizedException) return false; response.contentType(ContentTypes.TEXT_PLAIN_UTF8); response.write("Oh I'm worry, there was a problem"); return true; })
    Parameters:
    
    request - The request
    
    response - The response
    
    cause - The exception thrown by an earlier handler
    
    Returns:
    
    true if this handler has written a response; otherwise false in which case the default error handler will be invoked.
    
    Throws:
    
    java.lang.Exception - Throwing an exception will result in a 500 error code being returned with a basic error message.