open fun <T : Any> fallback(handler: Function<Throwable, T>): CircuitBreaker
Sets a default invoked when the bridge is open to handle the "request", or on failure if io.vertx.circuitbreaker.CircuitBreakerOptions is enabled.
The function gets the exception as parameter and returns the fallback result.
Return
the current io.vertx.rxjava.circuitbreaker.CircuitBreaker