Spring Boot测试中Toxiproxy注入延迟无效问题求助

正在进行POC验证，尝试在Spring Boot测试中用Toxiproxy注入延迟，但设置的latency toxic完全没效果。测试逻辑是ping www.google.com，期望延迟后输出可达状态，结果却立即打印了。附上测试代码，求排查思路。

@Testcontainers
public class ToxiproxyTest {

  @LocalServerPort
  private int port;

  // Toxiproxy container, which will be used as a TCP proxy
  @Container
  public static ToxiproxyContainer toxiproxy = new ToxiproxyContainer("ghcr.io/shopify/toxiproxy:2.5.0")
      .withNetwork(Network.newNetwork());

  private Proxy proxy;


  @SneakyThrows
  @BeforeEach
  public void setUp() {
    ToxiproxyClient toxiproxyClient = new ToxiproxyClient(toxiproxy.getHost(), toxiproxy.getControlPort());
    proxy = toxiproxyClient.createProxy("proxy", toxiproxy.getHost() + ":" + port, "www.google.com:80");
  }

  @SneakyThrows
  @Test
  public void testLatency() {
    proxy.toxics().latency("latency", ToxicDirection.DOWNSTREAM, 200000L);

    Process p1 = java.lang.Runtime.getRuntime().exec("ping -c 1 www.google.com");
    int returnVal = p1.waitFor();
    boolean reachable = (returnVal==0);
    System.out.println(reachable);
  }
}

• 核心问题：流量未经过Toxiproxy代理
  你的测试直接调用ping www.google.com，完全没走Toxiproxy创建的代理端口。Toxiproxy仅会拦截经过自身的流量，必须让请求先打到Toxiproxy的代理端口，再由它转发到目标地址，toxic规则才会生效。

• 代理配置错误
  创建Proxy时用了@LocalServerPort获取的端口，这个注解是用来获取当前Spring Boot应用的端口，和Toxiproxy的代理监听端口无关。应该让Toxiproxy自动分配或指定可用端口，测试时请求这个代理端口。

• 协议不兼容
  Toxiproxy仅支持TCP/UDP协议，而ping基于ICMP协议，代理根本无法拦截这类流量，必须改用TCP协议的请求（比如HTTP）来测试延迟效果。

• 修正后的代码示例

@Testcontainers
public class ToxiproxyTest {

    @Container
    public static ToxiproxyContainer toxiproxy = new ToxiproxyContainer("ghcr.io/shopify/toxiproxy:2.5.0");

    private Proxy proxy;

    @SneakyThrows
    @BeforeEach
    public void setUp() {
        ToxiproxyClient toxiproxyClient = new ToxiproxyClient(toxiproxy.getHost(), toxiproxy.getControlPort());
        // 让Toxiproxy自动分配监听端口，转发到www.google.com:80
        proxy = toxiproxyClient.createProxy("google-proxy", "0.0.0.0:0", "www.google.com:80");
    }

    @SneakyThrows
    @Test
    public void testLatency() {
        // 设置200ms下游延迟（原代码200000L是200秒，数值过大易超时）
        proxy.toxics().latency("latency", ToxicDirection.DOWNSTREAM, 200L);

        // 获取代理实际监听端口
        int proxyPort = proxy.getProxyPort();
        // 发送HTTP请求到Toxiproxy代理端口
        HttpClient client = HttpClient.newHttpClient();
        HttpRequest request = HttpRequest.newBuilder()
                .uri(URI.create("http://" + toxiproxy.getHost() + ":" + proxyPort))
                .build();

        long start = System.currentTimeMillis();
        HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
        long end = System.currentTimeMillis();

        boolean reachable = response.statusCode() >= 200 && response.statusCode() < 300;
        System.out.println("可达状态：" + reachable);
        System.out.println("请求耗时：" + (end - start) + "ms");
    }
}

• 额外注意事项
  • 测试延迟时建议先设置较小值（如200ms），避免因超时长导致测试失败。
  • 创建代理时用0.0.0.0:0可自动分配端口，避免端口冲突，后续通过proxy.getProxyPort()获取实际端口。

内容的提问来源于stack exchange，提问作者ham_ben