option splice-auto

I am trying to configure HAProxy to use connection splicing, however 1.3.17 does not seem to accept this option. I've tried splice-auto along with request and response without success. According to the configuration, placing it in the listen is acceptable - but it is returning "unknown option" on a configuration test.

Any ideas?

Robert.

Config:

listen rps-test 10.210.2.30:80

         mode http
         stats enable
         stats uri /stats
         option splice-request
         option httpclose
         balance roundrobin
         clitimeout 100000
         srvtimeout 30000
         contimeout 4000
         maxconn 40000
         server Web1 10.210.2.20:80
         server Web2 10.210.2.21:80
         server Web3 10.210.2.22:80

global
       	ulimit-n 1024576
         maxconn 40000
         stats socket /var/run/haproxy.socket