object HalfClosedWebsocketSupport
Workaround for https://doc.akka.io/docs/akka-http/current/client-side/websocket-support.html?language=scala#half-closed-websockets
The callers source doesn't complete, hence the websocket is kept open until the sender finishes. The callee still needs to know when the callers Source has completed, so a Wrapper is used indicating the end of stream with an empty Element.
You also need to define a serializer for the wrapped element, e.g: implicit val wrapperFormatter : play.api.libs.json.Format[Wrapper[Int]] = play.api.libs.json.Json.format
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