docs: public void handleMessage(T message) throws Fault {
          if (LOG.isLoggable(Level.FINEST)) {
              LOG.finest("FlowIdProducerOut Interceptor called. isOutbound: "
                      + MessageUtils.isOutbound(message) + ", isRequestor: "
                      + MessageUtils.isRequestor(message));
          }
  
          if (MessageUtils.isRequestor(message)) {
              handleRequestOut(message);
          } else {
              handleResponseOut(message);
          }
  
          // Don't write flowId for Oneway responses
          if (isOnewayResponse(message)) {
              return;
          }
  
          // write FlowId to HTTP and Soap layer
          String flowId = FlowIdHelper.getFlowId(message);
          FlowIdProtocolHeaderCodec.writeFlowId(message, flowId);
          FlowIdSoapCodec.writeFlowId(message, flowId);
  
      }