apollo-portal/src/main/java/com/ctrip/framework/apollo/openapi/v1/controller/NamespaceController.java/NamespaceController/loadNamespace
class NamespaceController:  @GetMapping(value = "/openapi/v1/envs/{env}/apps/{appId}/clusters/{clusterName}/namespaces/{namespaceName:.+}")
  public OpenNamespaceDTO loadNamespace(@PathVariable String appId, @PathVariable String env,
                                        @PathVariable String clusterName, @PathVariable String
                                            namespaceName) {
    return this.namespaceOpenApiService.getNamespace(appId, env, clusterName, namespaceName);
  }