The typical behaviour for REQUEST_REPLY is as follows:
- The request message is sent from the service consumer to the service
- The service consumer remains blocked while awaiting the reply
- The service remains blocked while processing the reply
- The METAR-SPECI, the reply message, is sent from the service to the service consumer.
In this case the service is based on WFS Geoserver and follows the behaviour of the Geoserver.
Reference
Geoserver Documentation
https://docs.geoserver.org/