Java Spring反应式Web—异常总是以500为单位包装

对于一个非常简单的项目，错误处理是不清楚的

public class WebfluxApplication {
    public static void main(String[] args) {
        SpringApplication.run(WebfluxApplication.class, args);
    }
}

我也尝试过在我的Mono上使用OneRorResume，但它从来都不正确，需要返回Mono而不是Mono

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文档和堆栈溢出没有太多/任何在RouterFunction中进行WebClient调用和处理不同类型响应的示例。

只需添加OneErrorResume即可解决问题。否则，该错误将在AbstractErrorWebExceptionHandler中处理

 return webClient
        .get()
        .uri(configProperties.getNotfound())
        .retrieve()
        .onStatus(HttpStatus::is4xxClientError, clientResponse -> {
            if(clientResponse.statusCode().equals(HttpStatus.NOT_FOUND)){
                return Mono.error(new HttpClientErrorException(HttpStatus.NOT_FOUND,
                        "Entity not found."));
            } else {
                return Mono.error(new HttpClientErrorException(HttpStatus.INTERNAL_SERVER_ERROR));
            }
        })
        .bodyToMono(String.class)
        .onErrorResume( e -> Mono.just(e.getMessage()) );

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为什么你需要它来处理你的请求。默认情况下，在Spring引导中，非映射URL返回404错误。此外，500错误是由于/api/v1/integration/notfound没有过时。它应该像从WebClient调用时一样。但这一次将出现循环。你的目的是什么？你可以从错误中看出，404是从哪里来的。我正在尝试处理来自外部客户端的404。如果我们的端点调用另一个端点，它应该能够处理任何状态代码。/ok端点工作正常。我完全误解了错误处理是如何工作的，这非常好！非常感谢。

public Mono<ServerResponse> goodEndpoint(ServerRequest r) {
    return ServerResponse.ok().build();
}

public Mono<ServerResponse> badEndpoint(ServerRequest r) {
    var result = service.badEndpoint();
    return ServerResponse
            .ok()
            .body(result, String.class);
}

public class Service
{
private final WebClient webClient;
private final ConfigProperties configProperties;

public Service(WebClient webClient, ConfigProperties configurationProperties) {
    this.webClient = webClient;
    this.configProperties = configurationProperties;
}

public Mono<String> badEndpoint() {
    return webClient
            .get()
            .uri(configProperties.getNotfound())
            .retrieve()
            .onStatus(HttpStatus::is4xxClientError, clientResponse -> {
                if(clientResponse.statusCode().equals(HttpStatus.NOT_FOUND)){
                    return Mono.error(new HttpClientErrorException(HttpStatus.NOT_FOUND,
                            "Entity not found."));
                } else {
                    return Mono.error(new HttpClientErrorException(HttpStatus.INTERNAL_SERVER_ERROR));
                }
            })
            .bodyToMono(String.class);
}

   2020-08-29 16:52:46.301 ERROR 25020 --- [ctor-http-nio-4] a.w.r.e.AbstractErrorWebExceptionHandler : [b339763e-1]  500 Server Error for HTTP GET "/api/v1/integration/notfound"

org.springframework.web.client.HttpClientErrorException: 404 Entity not found.
    at com.stevenpg.restperformance.webflux.Service.lambda$badEndpoint$0(Service.java:30) ~[main/:na]
    Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException: 
Error has been observed at the following site(s):
    |_ checkpoint ⇢ 404 from GET https://httpbin.org/status/404 [DefaultWebClient]
    |_ checkpoint ⇢ Handler com.stevenpg.restperformance.webflux.EndpointRouter$$Lambda$445/0x00000008003ae040@7799b58 [DispatcherHandler]
    |_ checkpoint ⇢ HTTP GET "/api/v1/integration/notfound" [ExceptionHandlingWebHandler]

 return webClient
        .get()
        .uri(configProperties.getNotfound())
        .retrieve()
        .onStatus(HttpStatus::is4xxClientError, clientResponse -> {
            if(clientResponse.statusCode().equals(HttpStatus.NOT_FOUND)){
                return Mono.error(new HttpClientErrorException(HttpStatus.NOT_FOUND,
                        "Entity not found."));
            } else {
                return Mono.error(new HttpClientErrorException(HttpStatus.INTERNAL_SERVER_ERROR));
            }
        })
        .bodyToMono(String.class)
        .onErrorResume( e -> Mono.just(e.getMessage()) );