'Spring Web client timeout fallback

I am having trouble with timeout fallback with spring web client. I want to call another method while timeout error happens. My web client call method:

String response = bkashWebClient
    .webClient()
    .get()
    .uri(queryPaymentUri, paymentId)
    .header("Authorization", bkashToken)
    .header("X-APP-Key", appKey)
    .retrieve()
    .onStatus(HttpStatus::isError, clientResponse ->
        Mono.error(new Exception("Error occurred while calling grant token" + clientResponse.statusCode())))
    .bodyToMono(String.class)
    .timeout(Duration.ofSeconds(30))
    .block();

I want to call a method suppose abc() while a timeout event happens. But I am not able to figure it out. How should I handle such a way so that when a timeout happens it will call another method and the method's return type is not Mono?

javaspringspring-bootspring-webfluxwebclient


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