web service consumption

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Hi expert,

we have two instance in our production.

web service are implemented in both instance

we have web dispatcher in front of the two instances.

we are using service group to configure the ws call.

the auto generated configuration always connect to specific instance, let's say http://instance1.demo.com/bpm/update/process/StartProcessIn?wsdl&mode=ws_policy.

it seems a single point of failure.

if instance1 is down. the call will be failed. but instance2 is alive, the call should go there.

so i want to know if i can configure the ws call in the service group that use the url of web dispatcher

at runtime it will automatically call the alive instance.

our system is CE7.2 SP4

the ws and ws consumer are in the same system.

thanks

John