Spring Webclient 总是给出超时错误

Question

我目前正在尝试构建一个 API，该 API 从 url 提供图像（以字节数组的形式）。这是我的代码：

@RestController
@SpringBootApplication
public class ReturnApplication {
    private static final Logger logger = Logger.getLogger(ReturnApplication.class.getSimpleName());

    @Autowired
    private  final WebClient.Builder webClientBuilder;

    public ReturnApplication() {
        this.webClientBuilder = WebClient.builder()
                .clientConnector(new ReactorClientHttpConnector(
                        HttpClient.create().followRedirect(true).wiretap(true)
                ));
    }

    @GetMapping("/quotes")
    public ResponseEntity<?> getRandomQuote() {
        logger.info("Get Random Quote");
        Object result = WebClient.create()
                .get()
                .uri("https://api.quotable.io/random")
                .accept(MediaType.APPLICATION_JSON)
                .retrieve()
                .bodyToMono(Object.class)
                .block();
        return new ResponseEntity(result, HttpStatus.OK);
    }
    public static void main(String[] args) {
        SpringApplication.run(ReturnApplication.class, args);
    }

}

但是，每次我尝试使用该服务时，都会出现这种错误：

java.net.ConnectException: Connection timed out: no further information
    at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) ~[na:1.8.0_201]
    at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717) ~[na:1.8.0_201]
    at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:330) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:334) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:710) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:658) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:584) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:496) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986) ~[netty-common-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.72.Final.jar:4.1.72.Final]
    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.72.Final.jar:4.1.72.Final]
    at java.lang.Thread.run(Thread.java:748) [na:1.8.0_201]

我尝试调试网络客户端，但它总是让我超时。我可以顺利地在浏览器中打开该网址。我的代码实际上有什么问题，我该如何解决这个问题？？

---

编辑

我决定再做一个spring boot api项目来测试是否是Webclient的问题，但实际上不是。之后，我尝试从命令行 ping 该 API url（我上面使用的那个），但总是超时。我也无法执行来自 CURL 的请求。我可以通过 Postman 或网络浏览器顺利地完成请求。因此，我应该怎么做才能使 Spring Webclient 能够从该 API 获取响应？

Answer 1

@GetMapping("/quotes")
    public ResponseEntity<?> getRandomQuote() {
        logger.info("Get Random Quote");
        Object result = WebClient.create()
                .get()
                .uri("https://api.quotable.io/random")
                .accept(MediaType.APPLICATION_JSON)
                .retrieve()
                .bodyToMono(Object.class)
                .timeout(Duration.ofSeconds(35));
                .block();
        return new ResponseEntity(result, HttpStatus.OK);
    }
    public static void main(String[] args) {
        SpringApplication.run(ReturnApplication.class, args);
    }

添加以下行

.timeout(Duration.ofSeconds(35));

。 可能调用图片API时超过了默认超时时间