I recently had a case where no body was sent with a POST REST call (Jira Webhook with the send empty body checked (we changed this afterwards)).
The HandlePost method in the RestEntitiesWebHandler then fails, because it just casts the Entity property to JsonObject, but in that case it's an empty OpenEdge.Core.Memptr.
We think this method should validate en check the type of the Entity property as according to
https://documentation.progress.com/output/oehttpclient/oe117/ this property can be of any type.