apollo-portal/src/main/java/com/ctrip/framework/apollo/openapi/v1/controller/AppController.java/AppController/findApps
class AppController:  @GetMapping("/apps")
  public List<OpenAppDTO> findApps(@RequestParam(value = "appIds", required = false) String appIds) {
    if (StringUtils.hasText(appIds)) {
      return this.appOpenApiService.getAppsInfo(Arrays.asList(appIds.split(",")));
    } else {
      return this.appOpenApiService.getAllApps();
    }
  }