apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/controller/ReleaseController.java/ReleaseController/get
class ReleaseController:  @GetMapping("/envs/{env}/releases/{releaseId}")
  public ReleaseDTO get(@PathVariable String env,
                        @PathVariable long releaseId) {
    ReleaseDTO release = releaseService.findReleaseById(Env.valueOf(env), releaseId);

    if (release == null) {
      throw new NotFoundException("release not found");
    }
    return release;
  }