apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/controller/ServerConfigController.java/ServerConfigController/loadServerConfig
class ServerConfigController:  @PreAuthorize(value = "@permissionValidator.isSuperAdmin()")
  @GetMapping("/server/config/{key:.+}")
  public ServerConfig loadServerConfig(@PathVariable String key) {
    return serverConfigRepository.findByKey(key);
  }