apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/controller/NamespaceController.java/NamespaceController/findPublicNamespaceForAssociatedNamespace
class NamespaceController:  @GetMapping("/envs/{env}/apps/{appId}/clusters/{clusterName}/namespaces/{namespaceName}/associated-public-namespace")
  public NamespaceBO findPublicNamespaceForAssociatedNamespace(@PathVariable String env,
                                                               @PathVariable String appId,
                                                               @PathVariable String namespaceName,
                                                               @PathVariable String clusterName) {

    return namespaceService.findPublicNamespaceForAssociatedNamespace(Env.valueOf(env), appId, clusterName, namespaceName);
  }