我没有成功使用ResponseInterceptor。
但是我找到了一个替代方法，使用faign.codec.Decoder。
在本例中，我正在阅读每个Feign客户端响应的Content-Language：

public class ClientResponseInterceptor implements Decoder {

    private final JacksonDecoder delegate;

    public ClientResponseInterceptor(JacksonDecoder delegate) {
        this.delegate = delegate;
    }

    @Override
    public Object decode(Response response, Type type) throws IOException, FeignException {
        String contentLanguageFromFeignResponse;

        Collection<String> contentLanguage = response.headers().get(HttpHeaders.CONTENT_LANGUAGE);
        // Extract this part in another method
        if (contentLanguage != null && !contentLanguage.isEmpty()) {
            Optional<String> attributeOpt = contentLanguage.stream().findFirst();
            if (attributeOpt.isPresent()) {
                contentLanguageFromFeignResponse = attributeOpt.get();
            }
        }

        // Do something with contentLanguageFromFeignResponse

        return delegate.decode(response, type);
    }
}

并在您的faign配置文件中声明它：

@Bean
public ClientResponseInterceptor responseInterceptor() {
    return new ClientResponseInterceptor(new JacksonDecoder(/*objectMapper*/));
}

(You可以使用另一个解码器，JacksonDecoder只是一个示例）