我有一个client1，它调用client2，client2调用数据生产者。client2订阅了producer并收到了没有问题的mono。但是client2在subscribe完成之前返回，client1没有得到有效的结果。
client1不是spring-boot，client2使用webflux和spring-boot
如何让client1接收有效值。

客户端1调用-->

Mono<ClientResponse>  method1(Request someRequest){

  WebClient webClient = buildWebClient(arg1);

        Mono<ClientResponse> webClientResponse = webClient.post()
                .uri("url")
                .accept(MediaType.TEXT_XML)
                .contentType(MediaType.TEXT_XML)
                .header("someheader")
                .body(BodyInserters.fromValue(request))
                .exchange();

       webClientResponse.subscribe(clientResponse -> {
            if(clientResponse.statusCode().value() == 200 && clientResponse.statusCode().getReasonPhrase().equals("OK")) {
                HttpHeaders headers = clientResponse.headers().asHttpHeaders();
                Mono<String> valueMono = clientResponse.bodyToMono(String.class);

                valueMono.subscribe(value -> {
    //got the value here 

              });
            }//ok
        });

      return null;//<--here return before subscribe has finished
    }
}