docker的healthcheck的ExitCode=3?

Question

在compose.yml里的代码是
healthcheck:

  test: ["CMD", "curl", "-fs", "http://localhost:2345","||","exit 1"]
  interval: 30s
  timeout: 10s 
  retries: 3 
  start_period: 30s 

然后运行起来之后状态一直是unhealthy，用inspect指令查看
然而进到容器内执行
curl -fs http://localhost:2345 然后 echo $? 得到的是0

为什么会ExitCode是3的？哪位大神解答一下？