请求Local主机时没有主机错误的途径，但是Curl请求成功

Question

我正在尝试通过我的Java代码从一项服务到另一个服务的POST请求。这两种服务始终在同一服务器上运行 我正在为此使用RESTTEMPLATE。请求URL：

    RestTemplate restTemplate = new RestTemplate(httpRequestFactory);
    HttpHeaders headers = new HttpHeaders();
    headers.set(HttpHeaders.CONTENT_TYPE, "application/x-protobuf");
    headers.set(HttpHeaders.ACCEPT, "text/plain");
    org.springframework.http.HttpEntity<byte[]> request = new org.springframework.http.HttpEntity<>(definitions.toByteArray(), headers);
    String url =  "http://localhost:8888/product-details/api/1.0/external_launches";
    restTemplate.exchange(url, HttpMethod.POST, request, Void.class);

当我在我的Linux服务器之一上运行此代码时，这是我遇到的错误：

2022-05-06 08:42:32,979 [209: Normal Priority Request Pool-62] ERROR test_appliance - I/O error on POST request for "http://localhost:8888/product-details/api/1.0/external_launches": No route to host (Host unreachable); nested exception is java.net.NoRouteToHostException: No route to host (Host unreachable):org.springframework.web.client.ResourceAccessException: I/O error on POST request for "http://localhost:8888/product-details/api/1.0/external_launches": No route to host (Host unreachable); nested exception is java.net.NoRouteToHostException: No route to host (Host unreachable)
org.springframework.web.client.ResourceAccessException: I/O error on POST request for "http://localhost:8888/product-details/api/1.0/external_launches": No route to host (Host unreachable); nested exception is java.net.NoRouteToHostException: No route to host (Host unreachable)
    at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:675) ~[spring-web-4.3.25.RELEASE.jar:4.3.25.RELEASE]
    at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:622) ~[spring-web-4.3.25.RELEASE.jar:4.3.25.RELEASE]
    at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:540) ~[spring-web-4.3.25.RELEASE.jar:4.3.25.RELEASE]

但是当我进入Linux框中并做出这样的卷曲请求时，

curl -X POST http://localhost:8888/product-details/api/1.0/external_launches

我

遇到的主要问题是行为仅在我的1台Linux机器中可再现。我还有其他3台Linux机器，Java代码可以很好地工作。

有什么想法吗？