code: @Override
    public Answer processRequest(IRequest request, IRealm matchedRealm) {
      logger.info("proxy agent: processRequest executed");
      return null;
    }
docs: /*
  (non-Javadoc)
  
  @see
  org.jdiameter.server.api.agent.IAgent#processRequest(org.jdiameter.client
  .api.IRequest, org.jdiameter.client.api.controller.IRealm)