带有文本/html响应的反应式WebClient GET请求 [英] Reactive WebClient GET Request with text/html response

问题描述

当前，我在使用新的Spring 5 WebClient时遇到问题，需要一些帮助来进行整理. 问题是:

Currently I’m having an issue with new Spring 5 WebClient and I need some help to sort it out. The issue is:

我请求一些返回json响应的URL，其内容类型为 text/html; charset = utf-8 .

但不幸的是，我仍然遇到一个例外: org.springframework.web.reactive.function.UnsupportedMediaTypeException: 不支持内容类型'text/html; charset = utf-8'.所以我不能 将响应转换为DTO.

But unfortunately I’m still getting an exception: org.springframework.web.reactive.function.UnsupportedMediaTypeException: Content type 'text/html;charset=utf-8' not supported. So I can’t convert response to DTO.

对于请求，我使用以下代码:

For request I use following code:

Flux<SomeDTO> response = WebClient.create("https://someUrl")
                .get()
                .uri("/someUri").accept(MediaType.APPLICATION_JSON)
                .retrieve()
                .bodyToFlux(SomeDTO.class);

response.subscribe(System.out::println);

顺便说一句，我指向接受标头的类型并不重要，总是返回text/html.那么我怎么才能最终转换我的回答?

Btw, it really doesn’t matter which type I point in accept header, always returning text/html. So how could I get my response converted eventually?

推荐答案

让服务发送带有"text/html" Content-Type的JSON是很不常见的.

Having a service send JSON with a "text/html" Content-Type is rather unusual.

有两种处理方法:

1. 将Jackson解码器配置为也解码"text/html"内容；查看WebClient.builder().exchangeStrategies(ExchangeStrategies)设置方法
2. 动态更改"Content-Type"响应标头

1. configure the Jackson decoder to decode "text/html" content as well; look into the WebClient.builder().exchangeStrategies(ExchangeStrategies) setup method
2. change the "Content-Type" response header on the fly

以下是第二种解决方案的建议:

Here's a proposal for the second solution:

WebClient client = WebClient.builder().filter((request, next) -> next.exchange(request)
                .map(response -> {
                    MyClientHttpResponseDecorator decorated = new 
                        MyClientHttpResponseDecorator(response); 
                    return decorated;
                })).build();

class MyClientHttpResponseDecorator extends ClientHttpResponseDecorator {

  private final HttpHeaders httpHeaders;

  public MyClientHttpResponseDecorator(ClientHttpResponse delegate) {
    super(delegate);
    this.httpHeaders = new HttpHeaders(this.getDelegate().getHeaders());
    // mutate the content-type header when necessary
  }

  @Override
  public HttpHeaders getHeaders() {
    return this.httpHeaders;
  }
}

请注意，您仅应在该上下文中(对于此主机)使用该客户端. 如果可以的话，我强烈建议您尝试修复服务器返回的那种奇怪的内容类型.

Note that you should only use that client in that context (for this host). I'd strongly suggest to try and fix that strange content-type returned by the server, if you can.

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