Spring WebClient - Purposefully returning bad request

Question

So I have a WebClient:

public Mono<UserObject> getData(String id){
    return webClient.get()
        .uri(/user/getData)
        .header("header", header)
        .bodyValue(id)
        .retrieve()
        .bodyToMono(UserObject.class);
}

If /user/getData returns a bad request, I want the WebClient to return a bad request too. Instead, WebClient throws an internal server error saying that I've got a bad request.

Desired output when executing the WebClient:

"status": 400,
"message" : "Bad Request"

Actual output:

"status": 500,
"message" : "org.springframework.web.reactive.function.client.WebClientResponseException$BadRequest: 400 Bad Request from GET .../user/getData"

it's logically correct because your 40x error is server error from client's view. — Lei Yang, Mar 14 '22 at 02:50

score 0 · Answer 1 · answered Mar 14 '22 at 02:52

0

Maybe you can create an error handler which is triggered by the exception and then attach the http error to the response. This answer shows how this can be done.

answered Mar 14 '22 at 02:52

finisinfinitatis

861
11
23

score 0 · Answer 2 · answered Mar 15 '22 at 06:23

You would need to handle error and return corresponding status

public Mono<UserObject> getData(String id){
    return webClient.post()
            .uri("/user/getData")
            .bodyValue(id)
            .retrieve()
            .bodyToMono(UserObject.class)
            .onErrorResume(e -> {
                if (e instanceof WebClientResponseException) {
                    var responseException = (WebClientResponseException) e;
                    
                    if (responseException.getStatusCode().is4xxClientError()) {
                        return Mono.error(new ResponseStatusException(responseException.getStatusCode()));
                    }
                }
                
                return Mono.error(e);
            });
}

Spring WebClient - Purposefully returning bad request

2 Answers2