Spring Cloud Gateway with logs

When using the Spring Cloud Gateway, I want to show the request/response details in logs. This thread helped a lot:

SpringCloudGateway - Log incoming request url and corresponding route URI

And the log is enabled by

@Bean
HttpClient httpClient() {
    return HttpClient.create().wiretap("LoggingFilter", LogLevel.INFO, AdvancedByteBufFormat.TEXTUAL);
}

However I found an issue for this solution:

As the HttpClient instance is created manually instead of created automatically, the Default Setting will be applied and the httpClient settings in application.yaml will not be applied.

As a result, some important configures such as max-idle-time in application.yml will not be effective.

After some diggings and checking source code, I finally got the solution, list below:

@Component
public class Config {

    private static Logger logger = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());

    @Autowired
    HttpClientProperties properties;

    @Autowired
    ServerProperties serverProperties;


    @Bean
    HttpClientFactory httpClientFactory() {
        List<HttpClientCustomizer> list = new ArrayList<>();
        list.add(httpClient -> {
            logger.info("Applying Logging filter to {}", httpClient);
            return httpClient.wiretap("LoggingFilter", LogLevel.INFO, AdvancedByteBufFormat.TEXTUAL);
        });
        HttpClientFactory factory = new HttpClientFactory(properties, serverProperties, list);
        return factory;
    }
}

The core idea is to init the http client by passing a HttpClientCustomizer, in which the logging is configured.