Now I have a cluster with 2 conductors.How can I send the API request to this cluster?Send it to the main conductor or send it to both of them?

When I call the Conductor API "paticipant.add",it always return as<?xml version='1.0'?><methodResponse><params><param><value><struct><member><name>status</name><value><string>operation successful</string></value></member></struct></value></param></pa...