When you run Business Central on WebSphere AS and try to make some REST Query API calls with a parameter without value (e.g. http://localhost:9080/business-central/rest/query/runtime/process?vv=john&all), it is ignored by the server. However, it works when you pass this parameter with empty value (e.g. http://localhost:9080/business-central/rest/query/runtime/process?vv=john&all=). A warning should be added to The REST Query API section of Development Guide, describing this problem. Note that this only occurs on WebSphere and parameters without value work without any problems on all other containers.