haproxy uses one server at a time only

I use haproxy in front of several servers to failover. My purpose is at one time, haproxy sticks to one online server only. I can do this with option “check backup” likes below.

frontend web_front
   ...

   default_backend web_backend
   ...

backend web_backend
   ....
   server s1 192.168.0.10:80 check
   server s2 192.168.0.11:80 check backup

This works well when everything ok, server s1 will be chosen normally. When server s1 is down, s2 will serve.

How can I make haproxy still use s2 even when s1 becomes online again?

Thanks,

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